[FIX] web_editor: make sidebar toolbar buttons smaller to avoid overflow

When a scrollbar appears in the sidebar, the toolbar could end up being
to wide, making a horizontal scrollbar appear. This commit makes the
toolbar buttons smaller (smaller padding) to avoid this.

closes odoo/odoo#119972

Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>

addons/web_editor/static/src/scss/wysiwyg_snippets.scss

@@ -513,7 +513,7 @@
             .btn {
                 @extend %we-generic-button;
                 display: flex;
-                padding: ($o-we-sidebar-content-field-height * .12) ($o-we-sidebar-content-field-button-group-button-spacing - 2);
+                padding: ($o-we-sidebar-content-field-height * .12) ($o-we-sidebar-content-field-button-group-button-spacing - 2.5);
             }
 
             #font-size > button {