[Linux] Use image width instead of gob width
[Linux] Use image width instead of gob width

They could be out of sync when gob width is set by REBOL script in
repsonse to the RESIZE, OFFSET or other events, in which case the
interpreter could crash due to invalid parameters

hostilefork/rebol,hostilefork/rebol,rgchris/ren-c,hostilefork/rebol,kealist/ren-c,codebybrett/ren-c,giuliolunati/ren-c,kealist/ren-c,mbk/ren-c,giuliolunati/ren-c,draegtun/ren-c,mbk/ren-c,mbk/ren-c,draegtun/ren-c,giuliolunati/ren-c,kealist/ren-c,draegtun/ren-c,codebybrett/ren-c,kealist/ren-c,hostilefork/rebol,mbk/ren-c,kealist/ren-c,codebybrett/ren-c,hostilefork/rebol,rgchris/ren-c,kealist/ren-c,codebybrett/ren-c,rgchris/ren-c,giuliolunati/ren-c,draegtun/ren-c,codebybrett/ren-c,giuliolunati/ren-c,codebybrett/ren-c,rgchris/ren-c,rgchris/ren-c,hostilefork/rebol,draegtun/ren-c,draegtun/ren-c