RC: Transparency for TabletUI {WIP}

Allows Tablets to set Transparency.
PS2: Don't disable preference on TabletUI selection

Signed-off-by: Zaphod <mwilson@acesappraisal.com>
Change-Id: I0e591b675cb00ca850fad745851d58a45c5096d9
Remove unneeded intent filter from TransparencyDialog