Update spacing and background color for condition/suggestion.

- changed suggestion/condition and searchbox background color to
  #F2F2F2
- changed condition card background color to #F8F8F8
- removed Suggestion header
- reduced space above condition header/footer by 9dp

Bug: 63393599
Test: make RunSettingsRoboTests
Change-Id: I268934e3a573b542480c0b21dbab68b7217295b5