Avoid checking for idle state when the app is in top state.

When we know that an app moved to a procstate that is considered
an interaction event, the app will not be in idle state. So, avoid
calling into UsageStatsService for idle state in this case.

Bug: 209338078
Test: atest tests/cts/hostside/src/com/android/cts/net/HostsideRestrictBackgroundNetworkTests.java
Change-Id: I5648db595d2fd10a151da13e472fd905bcafe182
Merged-In: I5648db595d2fd10a151da13e472fd905bcafe182