Proactively drop SHORT FGS procstate on timeout...

... Rather than waiting for the next "natural" oom-adjustment.

Bug: 257270313
Test: atest CtsShortFgsTestCases
Test: Manual test using a test app
checked all 3 events -- timeout, procstate demotion, and ANR

Change-Id: I0fcbccd2bb2ec1449284696b60f21022f6f67136