WifiServiceImpl: Return scan always available toggle state

APM mode on disables scan mode, but the API to retrieve the toggle state
should return the direct toggle state.

Bug: 171553041
Test: atest com.android.server.wifi
Change-Id: Idf1f87122c994e7c9084ab2e9df051dcc7937218
Merged-In: Idf1f87122c994e7c9084ab2e9df051dcc7937218
(cherry picked from commit 2d45af24f95d89f8683ce19ae3bbfc8df1ef9b29)
5 files changed