Change avatar to use Compound implementation (#11448)

* Move avatar to new compound implementation

* Make space avatars square

* Remove reference to the avatar initial CSS class

* remove references to mx_BaseAvatar_image

* Fixe test suites

* Fix accessbility violations

* Add ConfirmUserActionDialog test

* Fix tests

* Add FacePile test

* Fix items clipping in members list

* Fix user info avatar sizing

* Fix tests

src/components/views/elements/AppTile.tsx

@@ -526,7 +526,7 @@ export default class AppTile extends React.Component<IProps, IState> {
 
         return (
             <span>
-                <WidgetAvatar app={this.props.app} />
+                <WidgetAvatar app={this.props.app} size="20px" />
                 <b>{name}</b>
                 <span>
                     {title ? titleSpacer : ""}