Bug 1019426 - When searching in the Address Book from the Dialer a white tab is shown over the keyboard

We previously had two ways to hide the toolbar so this is removing one for more consistency.
This also removes the transitions because they were weird and not working reliably.
Merge pull request #20303 from Rik/keyboard-hide-toolbar-1019426

Bug 1019426 - When searching in the Address Book from the Dialer a white... r=etienne