fix(video-filmstrip): Place filmstrip videos over toolbar

css/_variables.scss

 $zindex3: 3;
 $toolbarBackgroundZ: 4;
 $labelsZ: 5;
-$filmstripVideosZ: 6;
 $subtitlesZ: 7;
 $popoverZ: 8;
 $zindex10: 10;
 $dropdownZ: 901;
 $centeredVideoLabelZ: 1010;
 $overlayZ: 1016;
+// Place filmstrip videos over toolbar in order
+// to make connection info visible.
+$filmstripVideosZ: $toolbarZ + 1;
 
 
 /**