isCarrierNetworkActive() should check if the carrier network is default

WifiPickerTrackerHelper should use MergedCarrierEntry.isDefaultNetwork()
for isCarrierNetworkActive().

Bug: 191090765
Test: atest WifiPickerTrackerHelperTest
Change-Id: I44d8eed3af019a8d6a30a4b743cad468d1f0469b
1 file changed