[FIX] website: hide the 'discuss' window when in edit mode

With [1] moving the website in backend, it is now possible to display
a backend discuss chat window while browsing your website.

This window is unfortunately hidden behind the SnippetEditor when it is
open.

The choice was made to hide the chat window when the edit mode is
activated, as it could hide some content of the page.

Steps to reproduce:
- Open a Discuss chat window using the systray item from the app grid
- Open website
- Click on Edit

Chat window is hidden.

[1]: https://github.com/odoo/odoo/commit/31cc10b91dc7762e23b4bde9b945be0c4ce3fe3b

task-2687506

closes odoo/odoo#100098

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

addons/website/static/src/components/editor/editor.scss

@@ -2,6 +2,9 @@
     .o_notification_manager {
         @include o-position-absolute($top: map-get($spacers, 2), $right: calc(#{$o-we-sidebar-width} + 0.5rem));
     }
+    .o_ChatWindowManager {
+        display: none !important;
+    }
 }
 
 .ui-autocomplete.o_website_ui_autocomplete {