[FIX] web_editor, *: use explicit string keys for color maps

* website

```
$map: (
    test: 1,
    black: 2,
);
@​debug map-get($map, 'test');
@​debug map-get($map, test);
@​debug map-get($map, 'black');
@​debug map-get($map, black);
```

The above code leads to a:
1
1
null
2

This is because maps' keys can be *anything* in sass (even other maps).
In the example, the map is defined with unquoted `test` and `black` as
keys which are understood as the string 'test' and the *color* black.
When asking for the value for the 'black' string key... there isn't any.

This commit forces the use of quoted string as color maps' keys.

addons/web_editor/static/src/scss/bootstrap_overridden.scss

@@ -13,14 +13,14 @@ $-main-color-lightness: lightness($-main-color);
 $-palette: map-merge((
     // alpha and beta colors are used to override primary and secondary BS4
     // colors by default, so that theme colors affect the default Odoo layouts
-    primary: $-main-color,
-    secondary: map-get($-palette, 'beta'),
+    'primary': $-main-color,
+    'secondary': map-get($-palette, 'beta'),
 
     // BS light and dark colors are not used for any BS component, just
     // for color utilities. By default, we set them to a very light and
     // very dark version of a desaturate version of the primary color
-    light: lighten(desaturate($-main-color, 40%), min(70%, max(0%, 97% - $-main-color-lightness))), // Does not increase over 97% lightness
-    dark: darken(desaturate($-main-color, 40%), min(70%, max(0%, $-main-color-lightness - 10%))), // Does not lower under 10% lightness
+    'light': lighten(desaturate($-main-color, 40%), min(70%, max(0%, 97% - $-main-color-lightness))), // Does not increase over 97% lightness
+    'dark': darken(desaturate($-main-color, 40%), min(70%, max(0%, $-main-color-lightness - 10%))), // Does not lower under 10% lightness
 ), o-map-omit($-palette));
 @if $-is-backend {
     $-palette: map-remove($-palette, 'primary', 'secondary', 'success', 'info', 'warning', 'danger', 'light', 'dark');

addons/web_editor/static/src/scss/web_editor.variables.scss

@@ -231,23 +231,23 @@ $o-color-palette-number: 1;
 // Theme colors
 $o-theme-color-palettes: (
     (
-        alpha: $o-enterprise-primary-color,
-        beta: $o-enterprise-color,
-        gamma: #5C5B80,
-        delta: #5B899E,
-        epsilon: #E46F78,
+        'alpha': $o-enterprise-primary-color,
+        'beta': $o-enterprise-color,
+        'gamma': #5C5B80,
+        'delta': #5B899E,
+        'epsilon': #E46F78,
     ),
 ) !default;
 $o-theme-color-palette-number: 1;
 
 // Greyscale transparent colours
 $o-transparent-grays: (
-    black-25: rgba(black, 0.25),
-    black-50: rgba(black, 0.5),
-    black-75: rgba(black, 0.75),
-    white-25: rgba(white, 0.25),
-    white-50: rgba(white, 0.5),
-    white-75: rgba(white, 0.75),
+    'black-25': rgba(black, 0.25),
+    'black-50': rgba(black, 0.5),
+    'black-75': rgba(black, 0.75),
+    'white-25': rgba(white, 0.25),
+    'white-50': rgba(white, 0.5),
+    'white-75': rgba(white, 0.75),
 ) !default;
 $o-gray-color-palettes: (
     (

addons/website/static/src/scss/primary_variables.scss

@@ -8,16 +8,16 @@ $o-theme-layout: 'full';
 $-palettes: ();
 @each $palette in $o-color-palettes {
     $-palettes: append($-palettes, map-merge((
-        body: null, // Default to bootstrap
-        menu: #F9F9F9,
-        footer: #F9F9F9,
-        text: null, // Default to bootstrap
-        h1: null, // Default to text
-        h2: null, // Default to h1
-        h3: null, // Default to h2
-        h4: null, // Default to h3
-        h5: null, // Default to h4
-        h6: null, // Default to h5
+        'body': null, // Default to bootstrap
+        'menu': #F9F9F9,
+        'footer': #F9F9F9,
+        'text': null, // Default to bootstrap
+        'h1': null, // Default to text
+        'h2': null, // Default to h1
+        'h3': null, // Default to h2
+        'h4': null, // Default to h3
+        'h5': null, // Default to h4
+        'h6': null, // Default to h5
     ), $palette));
 }
 $o-color-palettes: $-palettes;