[FIX] web_editor, website: restore style of the autocomplete dropdown

Before this commit, the autocomplete dropdown no longer had a maximum
height, which meant that when it contained a lot of elements, it hid the
entire editor panel.

Indeed, since the CSS of the menu snippet is no longer that of the
"frontend", the 'max-height' CSS rule defined for the autocomplete
dropdown in the frontend (introduced by this commit: [1]) was no longer
applied on the autocomplete dropdown of the backend.

In this commit, we therefore moved this css code of the
'ui-autocomplete' defined for the frontend into the common css file
(backend + frontend) in order to return to a situation where this code
was applied to all autocomplete dropdowns in Website. And thanks to
that, we were able to remove the css file "edit_menu.scss" which
copied/pasted the frontend 'ui-autocomplete' code for only one of the
backend 'ui-autocomplete'.

[1]: https://github.com/odoo/odoo/commit/032dd007157de00b683a9d753aa929741c107c01

task-2900529

closes odoo/odoo#102719

X-original-commit: cce26d7697c73326e0a6f2ec81e01b56b4156ad4
Signed-off-by: Romain Derie (rde) <rde@odoo.com>

addons/web_editor/static/src/scss/web_editor.common.scss

@@ -1002,3 +1002,25 @@ section, .oe_img_bg, [data-oe-shape-data] {
         }
     }
 }
+
+// Autocomplete dropdowns
+.ui-autocomplete {
+    max-height: 50vh;
+    overflow-y: auto;
+    overflow-x: hidden;
+
+    .ui-menu-item {
+        padding: 0;
+        > .ui-state-active {
+            border: none;
+            font-weight: normal;
+            margin: 0;
+        }
+    }
+    .fw-bold {
+        // Needed because the font-family is not "system fonts everywhere" as
+        // elements around it. TODO: use "system fonts everywhere" for
+        // the 'ui-autocomplete' and remove this line.
+        font-weight: 700 !important;
+    }
+}

addons/web_editor/static/src/scss/web_editor.frontend.scss

@@ -15,20 +15,6 @@
     transform: translate(-50%, -50%)
 }
 
-.ui-autocomplete {
-    max-height: 50vh;
-    overflow-y: auto;
-    overflow-x: hidden;
-
-    .ui-menu-item {
-        padding: 0;
-        > .ui-state-active {
-            border: none;
-            font-weight: normal;
-            margin: 0;
-        }
-    }
-}
 @include media-breakpoint-down(md) {
     .o_we_shape {
         display: none;

addons/website/static/src/components/dialog/edit_menu.scss

@@ -1,16 +0,0 @@
-.ui-autocomplete.o_edit_menu_autocomplete {
-    max-height: 50vh;
-    overflow-y: auto;
-    overflow-x: hidden;
-    .ui-menu-item {
-        padding: 0;
-        > .ui-state-active {
-            border: none;
-            font-weight: normal;
-            margin: 0;
-        }
-    }
-    .fw-bold {
-        font-weight: 700 !important;
-    }
-}