Kill the process with pending task removal on OomAdjuster updates

Fix the issue where it was checking for the "set" process state,
which means the process will be killed when next time this app
is being background.

Bug: 308029155
Bug: 339697954
Test: Manual

Merged-In: I6bef56445497d2edcb59a44a6d42dcdb027a6126
Change-Id: Ifb77329dfa2fe4a468a6676cb8b08bb5f1943633