Fix UI regression for COMPUTER profile

1. Relaxed the condition by using findLastVisibleItemPosition insteah to enable the Allow button, also removed the bottom padding for the item in the permission list.
2. Restore the text for title.

Test: CTS
Fix: 411421690
Flag: EXEMPT test fix
Change-Id: I725d951af6d2eca6b5a4b580204b1cdd0c08f821