[WifiTrackerLib] Fix Passpoint entry scan updates

Fixed PasspointWifiEntry handling in wifi picker, saved networks page,
and network details page to update correctly with empty scans when out
of range.

Test: atest WifiTrackerLibTests
Bug: 70983952
Change-Id: I8761aee5b478e3d225e026cb69d21bab69168955
(cherry picked from commit 6d77b880dad02eccb44b5c75d97eaf20de669a27)
Merged-In: I8761aee5b478e3d225e026cb69d21bab69168955
5 files changed