Do no preload dialpad fragment when opening search through search bar.

If the dialpad is preloaded it steals focus from the search bar. Aside
from this, I believe this change also caused other regressions and makes
the code harder to understand.

Test: tap
PiperOrigin-RevId: 185883795
Change-Id: Idbaca1df50ed02a698eb454cbb9de26a11e35f05