fix isActiveNetworkMetered with VPNs

Clean cherry-pick of ag/3580901
Bug: 72871435
Test: flashed and verified, also ran runtest framework-net
Merged-In: I177eff1237dd59514ccf91397a3d307148bc37b1

Change-Id: Ic5919a32f91f7baee5f1370703ad166e6ea52b58
1 file changed