Do not close the settings panel on tap

1. Fix the experience of tapping on the empty space in magnification
   settings panel and keep the panel open when tapping on the space without any elements on the panel.
2. Remove the rules for buttons set other than in onClickListener. The
   behaviors of buttons will always remain the same.

Bug: 265362818
Test: manually - attach videos to the bug
Change-Id: I78267c0bd31b7e6af05c06b0ac24962115ea7f35