Resume-on-Reboot: remove special string

User feedback shows that this string causes confusion that the
update is going to start immediately.

Bug: 161179448
Test: Fake OTA test
Change-Id: I9590ebf76c81ef104f490ba31ada7c482cd70d56
(cherry picked from commit 3750b50e76e484e956e1d721a4e09ea1b0f94480)
89 files changed