Fun glitch on Add Element view

This issue has been migrated from mozilla/webmaker-android#1984.

It was originally written by flukeout on Thu May 21 2015 and had the following description:

Steps to reproduce

• Tap Add Element
• Now, start tapping quickly anywhere else on the dark overlay
• You can get it to turn off and on indefinitely as long as you keep tapping!

cc **@**thisandagain

On Sat Jun 06 2015, errietta commented:

I think https://github.com/mozilla/webmaker-android/pull/2105 fixes that