Make theme title width match_parent

Change-Id: Ica4f4c067d27a1c1ee6b9023dee4d70076251859
(cherry picked from commit 7277d1d183a830c6937ba519dc6cb044ef2b3c3f)
Fix style previews scaling in ComponentBrowseFragment

Change-Id: I19482b7ded6a8854271636faa468928caec80011
(cherry picked from commit 7c36fde12d51b10a0384ee544fd5504563a101d9)