Revert "Temporarily disable hover cards"

This reverts commit 935b955b15.

app/javascript/flavours/glitch/features/ui/index.jsx

@@ -651,7 +651,7 @@ class UI extends PureComponent {
 
           {layout !== 'mobile' && <PictureInPicture />}
           <NotificationsContainer />
-          {/* Temporarily disabled while upstream improves the issue */ null && <HoverCardController />}
+          <HoverCardController />
           <LoadingBarContainer className='loading-bar' />
           <ModalContainer />
           <UploadArea active={draggingOver} onClose={this.closeUploadModal} />