Fix karaoke (\kf) timing
Fix karaoke (\kf) timing

The timing for the \kf karaoke which gradually fills the character from
left to right, uses clipping and isn't aware of subpixel accuracy.  This
is simply fixed by casting these value to int.

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