ncurses: readd "bsdpads"

During the import of ncurses 6.5 some bsd specifics configuration where
lost and reintroduce quickly after the import, unfortunatly there was a
typo in this fix which caused the "bsdpads" to not be enabled in
ncurses.

Fortunatly only very old programs may be affected by this change,
unfortunatly Nethack (in the ports tree is one of them.)

PR: 287358
MFC After: 3 days