Restore GPG recipient tests

[jaromil]

Deactivated here https://github.com/dyne/Tomb/blob/62806769afd44b61b5fa81785229db7735bac9a1/extras/test/setup#L64

it seems that recent versions of GnuPG v2 have broken our parsing of success in the operation based on exit value.

tests are currently deactivated from this switch.