Update the behavior to match the documentation.

Test: atest android.devicepolicy.cts.QuietModeTest
Bug: 297179116
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:bc72f89e1f88ec7e5babe37e0732bb1bc61d6b83)
Merged-In: I2d0cd06f0021f76fe780dcf21e3cb18279190a92
Change-Id: I2d0cd06f0021f76fe780dcf21e3cb18279190a92
2 files changed