Fix x coordinates with PAR correction and left border
Fix x coordinates with PAR correction and left border

This is a bit hacky, but I'm planning to rewrite positioning in a
much cleaner way. Addresses GC issue #27.

ShiftMediaProject/libass,tgoyne/libass,ShiftMediaProject/libass,grigorig/libass,Akemi/libass,xbmc/libass,blinkseb/libass,stps/libass,rhlee/libass,libass/libass,pigoz/libass-ct,Akemi/libass,richardpl/libass,torque/libass,mwgoldsmith/libass,blinkseb/libass,Akemi/libass,sanyaade-g2g-repos/libass,sanyaade-g2g-repos/libass,MrSmile/libass,torque/libass,rhlee/libass,astiob/libass,pigoz/libass-ct,Distrotech/libass,rhlee/libass,blinkseb/libass,stps/libass,MrSmile/libass,asimonov-im/libass,xbmc/libass,pigoz/libass-ct,torque/libass,astiob/libass,asimonov-im/libass,sanyaade-g2g-repos/libass,mwgoldsmith/libass,tgoyne/libass,Distrotech/libass,richardpl/libass,Distrotech/libass,tgoyne/libass,grigorig/libass,stps/libass,libass/libass,richardpl/libass,mwgoldsmith/libass