fix(avatar): Remove unnecessary code.

modules/UI/UI.js

 // Used by torture.
 UI.dockToolbar = dock => APP.store.dispatch(dockToolbox(dock));
 
-/**
- * Updates the displayed avatar for participant.
- *
- * @param {string} id - User id whose avatar should be updated.
- * @param {string} avatarURL - The URL to avatar image to display.
- * @returns {void}
- */
-UI.refreshAvatarDisplay = function(id) {
-    VideoLayout.changeUserAvatar(id);
-};
-
 /**
  * Notify user that connection failed.
  * @param {string} stropheErrorMsg raw Strophe error message

modules/UI/videolayout/VideoLayout.js

         }
     },
 
-    changeUserAvatar(id, avatarUrl) {
-        if (this.isCurrentlyOnLarge(id)) {
-            largeVideo.updateAvatar(avatarUrl);
-        }
-    },
-
     isLargeVideoVisible() {
         return this.isLargeContainerTypeVisible(VIDEO_CONTAINER_TYPE);
     },

react/features/base/participants/middleware.ts

     // Send an external update of the local participant's raised hand state
     // if a new raised hand state is defined in the action.
     if (typeof raisedHandTimestamp !== 'undefined') {
-
         if (local) {
             const { conference } = getState()['features/base/conference'];
             const rHand = parseInt(raisedHandTimestamp, 10);
         }
     }
 
-    // Notify external listeners of potential avatarURL changes.
-    if (typeof APP === 'object') {
-        const currentKnownId = local ? APP.conference.getMyUserId() : id;
-
-        // Force update of local video getting a new id.
-        APP.UI.refreshAvatarDisplay(currentKnownId);
-    }
-
     return result;
 }