Showing uninstall message in dialog's title

Showing the uninstalling message in AlertDialog's title instead of the
message field improves its UI and the dialog doesnt appear cut on Auto
targets.

Bug: 231530808
Test: Manual. Install an app and uninstall it from Settings > Apps
Change-Id: I4da746774d7c82066a2c18ad8b6b7222a9e6999d