Comply w/ coding style

react/features/filmstrip/components/Thumbnail.js

             };
         }
 
-        const thumbToolbarStyle = styles.thumbnailIndicatorContainer;
-
         // We don't render audio in any of the following:
         // 1. The audio (source) is muted. There's no practical reason (that we
         //    know of, anyway) why we'd want to render it given that it's
                 { participant.dominantSpeaker
                     && <DominantSpeakerIndicator /> }
 
-                <Container style = { thumbToolbarStyle }>
+                <Container style = { styles.thumbnailIndicatorContainer }>
                     { audioMuted
                         && <AudioMutedIndicator /> }
 

react/features/filmstrip/components/styles.js

     },
 
     /**
-     * Video thumbnail style.
+     * The style of a participant's Thumbnail which renders either the video or
+     * the avatar of the associated participant.
      */
     thumbnail: {
         alignItems: 'stretch',