[FIX] web_editor: fixes the rgb/rgba color selection

Before this commit, `selectStyle` could incorrectly split the
widgetValue (as described below) which resulted in invalid CSS.

widgetValue: `"rgba(55, 12, 99, 0.7) 55px"`
result: `["rgba(55,", "12,", "99,", "0.7)", "55px"]`
expected: `["rgba(55, 12, 99, 0.7)", "55px"]`
fixed: `["rgba(55,12,99,0.7)", "55px"]`

This commit fixes the issue.

closes odoo/odoo#47515

X-original-commit: 37e6b87341e58769ec2c1d080986e84286d84978
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

addons/web_editor/static/src/js/editor/snippets.options.js

@@ -1607,7 +1607,9 @@ const SnippetOptionWidget = Widget.extend({
             widgetValue = `var(--${widgetValue})`;
         }
 
-        const values = widgetValue.split(/\s+/g);
+        // replacing ', ' by ',' to prevent attributes with internal space separators from being split:
+        // eg: "rgba(55, 12, 47, 1.9) 47px" should be split as ["rgba(55,12,47,1.9)", "47px"]
+        const values = widgetValue.replace(/,\s/g, ',').split(/\s+/g);
         while (values.length < cssProps.length) {
             switch (values.length) {
                 case 1: