Add correct RSSI for OSU entries in wifi picker

OSU entries should now display the correct RSSI retrieved from its
scan results.

Tracking bug for adding robolectric tests: b/122849296

Bug: 118705403
Test: manual, build and check scan results in verbose mode
Change-Id: Ie89bb94cfcef20f5dec6d4419e536aadaaed4ca5
2 files changed