fix(UI): Disable doubleClickForFullscreen while casting (#8488)

Author: avelad

ui/controls.js

@@ -648,6 +648,9 @@ shaka.ui.Controls = class extends shaka.util.FakeEventTarget {
    * @export
    */
   isFullScreenSupported() {
+    if (this.castProxy_.isCasting()) {
+      return false;
+    }
     if (this.shouldUseDocumentFullscreen_()) {
       return true;
     }