systemctl: never check inhibitors if -H or -M are used (#3781)

systemctl: never check inhibitors if -H or -M are used (#3781)

Don't check inhibitors when operating remotely. The interactivity inhibitors
imply can#t be provided anyway, and the current code checks for local sessions
directly, via various sd_session_xyz() APIs, hence bypass it entirely if we
operate on remote systems.

Fixes: #3476