Improve Bluetooth pairing dialog & contact sharing toggle

Before change: https://screenshot.googleplex.com/Agr29KTvgptbsag
After change: https://screenshot.googleplex.com/ArjiavkFAFiuCTR

Bug: 274521434
Test: RunSettingsRoboTests
Change-Id: Ib896b70bc219de128b733b75249bf80e3389f221
5 files changed