probe-android: improve warnings when a VPN in enabled

[jbonisteel]

This was originally reported in: #2756

p2: even though I have a VPN active when I re-open the app the warning of a VPN being active goes away. edit: this is still valid issue. I don't know if I'm doing something silly in how I declare the VPN being such. We should work on figuring that out, but I am reducing the priority of these two issues.