Fix Vive Focus Plus casting (#1358)

Author: MortimerGoro

app/src/common/shared/org/mozilla/vrbrowser/ui/OffscreenDisplay.java

@@ -80,9 +80,7 @@ public void onResume() {
             DisplayManager manager = (DisplayManager) mContext.getSystemService(Context.DISPLAY_SERVICE);
             Display defaultDisplay = manager.getDisplay(Display.DEFAULT_DISPLAY);
 
-            int flags = DisplayManager.VIRTUAL_DISPLAY_FLAG_OWN_CONTENT_ONLY |
-                    DisplayManager.VIRTUAL_DISPLAY_FLAG_PRESENTATION |
-                    DisplayManager.VIRTUAL_DISPLAY_FLAG_PUBLIC;
+            int flags = DisplayManager.VIRTUAL_DISPLAY_FLAG_OWN_CONTENT_ONLY;
             defaultDisplay.getMetrics(mDefaultMetrics);
 
             mVirtualDisplay = manager.createVirtualDisplay("OffscreenViews", mWidth, mHeight,