fix(participants-pane): Don't show 'grant moderator' action if already moderator

react/features/base/participants/functions.js

         return false;
     }
 
-    return localParticipant.role === PARTICIPANT_ROLE.MODERATOR;
+    return isParticipantModerator(localParticipant);
 }
 
 /**

react/features/participants-pane/components/MeetingParticipantContextMenu.js

     IconMuteEveryoneElse,
     IconVideoOff
 } from '../../base/icons';
-import { isLocalParticipantModerator } from '../../base/participants';
+import { isLocalParticipantModerator, isParticipantModerator } from '../../base/participants';
 import { getIsParticipantVideoMuted } from '../../base/tracks';
 import { openChat } from '../../chat/actions';
 import { GrantModeratorDialog, KickRemoteParticipantDialog, MuteEveryoneDialog } from '../../video-menu';
                 ))}
             </ContextMenuItemGroup>
             <ContextMenuItemGroup>
-                {isLocalModerator && (
+                {isLocalModerator && !isParticipantModerator(participant) && (
                     <ContextMenuItem onClick = { grantModerator }>
                         <ContextMenuIcon src = { IconCrown } />
                         <span>{t('toolbar.accessibilityLabel.grantModerator')}</span>