Dashboard search bar polish

Various tweaks to match redlines:
- background is now grey all the time
- the search icon is aligned with the other icons
- the title text is primary colored instead of accent colored
- the background of search bar doesn't scroll anymore

Deletes a bunch of logic to add an initial view that would be
colored based on the first view. It never quite worked right.
Now it's consistent and never moves.

Bug: 37477506
Change-Id: I82c584e8f8ecc6fc298c5cdbce08516c6a069a39
Fixes: 62267378
Fixes: 62379978
Fixes: 62361213
Test: robotests