[3/4] Label does not change after changing quality

3/4 compatibility fix VideoJs 7+

The decision is very bad. I did not find another option to access the button to change the values. But it works.

kmoskwiak#129 (comment)

lib/videojs-resolution-switcher.js

@@ -42,6 +42,7 @@
       if(!this.player_)return false;
       var selection = this.player_.currentResolution();
       this.selected(this.options_.label === selection.label);
+      this.player_.controlBar.resolutionSwitcher.lastElementChild.textContent = selection.label;
     };
     MenuItem.registerComponent('ResolutionMenuItem', ResolutionMenuItem);