Fix VPN Request dialog appearing each time VPN is connecting

cause: ConfirmDialog is shown when prepareVpn(package, null)
returns false when the package is in always-on mode

We added the code in ag/949136 to stop app replacing app currently set to always-on.

Bug: 28941235
Change-Id: I370e56ad59332cc3fb722a98730fa73a97e26831
1 file changed