Don't apply the ActionBar style to a Toolbar as a result of setActionBar

While this is a convenient idea, it effectively means that any styling
directly applied to a Toolbar in a layout gets stomped by the
theme-global ActionBar style. Obey the more local, specific styling
from the Toolbar instead.

Change-Id: Ief6a7cb90052bdced87f1dc0925c1dfbc0df4792