Fix call animation from speaker to grid view so animating speaker is on top

stylesheets/_modules.scss

@@ -4352,6 +4352,8 @@ button.module-image__border-overlay:focus {
     line-height: 0;
     overflow: hidden;
     border-radius: 10px;
+
+    // Should match GroupCallRemoteParticipant CONTAINER_TRANSITION_TIME
     transition:
       top 200ms linear,
       inset-inline-start 200ms linear,
@@ -4531,6 +4533,10 @@ button.module-image__border-overlay:focus {
       }
     }
 
+    &--is-on-top {
+      z-index: variables.$z-index-above-above-base;
+    }
+
     &:hover {
       .module-ongoing-call__group-call-remote-participant__info__contact-name {
         display: block;