Update BS warning to follow through on action

The BS warning only had support for following through when a user
wanted to toggle battery saver. This also makes it so that if
the warning is shown for routines it will finish whatever action
it interrupted once confirmed.

Test: robotests pass, manual verification
Bug: 129696128
Change-Id: I2c34ed678b19d95f3c7d1094ab8f79cc0c23252e