fix fluent theme class overrides

Author: OEvgeny

packages/fluent-theme/src/components/activity/PartGroupingDecorator.module.css

@@ -634,7 +634,7 @@
         position: static;
         width: var(--webchat-part-grouping__bubble--max-width);
 
-        :global(.webchat__bubble__content .webchat__adaptive-card-renderer > .ac-adaptiveCard) {
+        :global(.webchat__bubble__content .adaptive-card-renderer > .ac-adaptiveCard) {
           font-family: var(--webchat-fontFamilyBase);
           /* Remove double padding for adaptive cards inside bubble */
           padding: unset !important;