Check if app's ntwk state will be changed before updating procstate.

We check previous set procstate and the current procstate in the
UidRecord to see if the app's network access state is going to be
changed and so it needs to be done before we change the setProcstate
in the UidRecord.

Bug: 224438257
Bug: 218308105

Test: atest tests/cts/hostside/src/com/android/cts/net/HostsideRestrictBackgroundNetworkTests.java
Change-Id: I0f3a4ca18cd889f49e3e3651799c3c14f9c2e218