WifiManagerTest: Allow removeAppState on R devices

This helps clean up state between tests. There is no need to gate this
API on R devices (since it is limited to settings app, etc).

Bug: 181718421
Test: atest android.net.wifi.cts
Change-Id: Iec1ce3a0cbfe38c257d32bad5ac9eb56bc7efbcd
2 files changed