Do not check battery charging state after "dumpsys battery unplug".

The check is somehow failing on the server, and we shouldn't have to do it
anyway in the first place.

Bug: 72954671
Test:  atest $ANDROID_BUILD_TOP/cts/tests/tests/batterysaving/src/android/os/cts/batterysaving/BatterySaverAlarmTest.java
Change-Id: Id0b5b2e7ac3451b8a9471e97d29d958883afe8c4
1 file changed