Cartographer can be visited more than once

[kambala-decapitator]

Per FizMig each cartographer type can be visited only once. I've experienced the following:

1. visit Surface Cartographer on the surface - reveals surface map, takes 1000 gold
2. visit Surface Cartographer underground (on non-subterra) - takes 1000 gold, doesn't reveal any new map

This issue might simply be a corollary of #1338 + #1339, re-test after fixing those.

initially discovered in #1303

P.S. Than's quite an old bug: https://bugs.vcmi.eu/view.php?id=1986