If didSomething condition is reversed.

updateOomAdjLocked() should be called when didSomething is true.

When startActivity, WindowManager post a runnable to DisplayThread and
ActivityManagerService to update UidRecord's proc state, because the
thread switch, sometimes proc state does not get updated on time.

This fix will make updateOomAdjLocked() is called immediately after
startActivity.

Bug: 155110902
Test: regression test
atest cts/tests/app/src/android/app/cts/ActivityManagerProcessStateTest.java

Change-Id: Icdb93fbd25c3c281c7dfdaafe190765630e7b64e