Use if instead of switch for resources

Converting to Soong will move some code from directly compiled
into the app to compiled into an Android library and then
shared between the app and the tests.  This will cause resource
IDs in the library to become non-final, which means they can
no longer be used in case statements.  Convert affect case
statements to if blocks.

Test: m RunSettingsRoboTests
Change-Id: I25742a374f06d3fa4decbfc0d223a350acc50881