[FIX] web_editor: ensure editor's floating toolbar is visible in modals

Bootstrap sets a z-index of 1050 for modals while the editor's floating
toolbar has no set z-index and is therefore invisible in modals. This
ensures the visibility of the toolbar in bootstrap modals.

closes odoo/odoo#69160

X-original-commit: 9cd4eb6db072fd55d47240260e63fd5923b3bddb
Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>

addons/web_editor/static/src/scss/wysiwyg.scss

@@ -34,6 +34,7 @@ $o-we-zindex: $o-we-overlay-zindex + 1 !default;
     background-color: $o-we-bg;
     color: $o-we-color;
     font-family: $o-we-font-family;
+    z-index: 1051; // Bootstrap sets .modal z-index at 1050. Ensure toolbar is visible in modals.
 
     &.noarrow::before {
         display: none;