fix(ui): Fix hiding controls on mobile after closing menu

Conflicting touch event listeners in OverflowMenu and Controls led to
a weird situation in which the controls container was seen as being
hovered after tapping to close the overflow menu.  This, in turn, led
the controls to stay open instead of hiding.

Removing the extra event listener in OverflowMenu allows the controls
to be properly hidden when the overflow menu is closed.

Issue shaka-project#2886

Change-Id: I18688efbcc6c4129b7b03e9daf00964d3a8d9802

ui/overflow_menu.js

@@ -111,16 +111,6 @@ shaka.ui.OverflowMenu = class extends shaka.ui.Element {
       this.onOverflowMenuButtonClick_();
     });
 
-    this.eventManager.listen(
-        this.controlsContainer_, 'touchstart', (event) => {
-        // If the overflow menu is showing, hide it on a touch event
-          if (!this.overflowMenu_.classList.contains('shaka-hidden')) {
-            shaka.ui.Utils.setDisplay(this.overflowMenu_, false);
-            // Stop this event from becoming a click event.
-            event.preventDefault();
-          }
-        });
-
     this.updateAriaLabel_();
   }