vt: respect relative position mode when clamping cursor
vt: respect relative position mode when clamping cursor

Signed-off-by: Marc Andre Tanner <cc7c5be316e48d137cbb549833b85d91034d799d@brain-dump.org>

medgar123/dvtm,medgar123/dvtm,seanyeh/dvtm,benjohnson2001/dvtm,raedwulf/dvtm,armanbilge/dvtm,delphinus35/dvtm,tgvaughan/dvtm,tgvaughan/dvtm,seanyeh/dvtm,gridsystem/dvtmx,benjohnson2001/dvtm,raedwulf/dvtm,seanyeh/dvtm,lotrfan/dvtm,medgar123/dvtm,lotrfan/dvtm,armanbilge/dvtm,gridsystem/dvtmx,delphinus35/dvtm,tgvaughan/dvtm,lotrfan/dvtm,raedwulf/dvtm,benjohnson2001/dvtm