Fix SOURCE of INTEGER! interaction
Fix SOURCE of INTEGER! interaction

This improves the hack to compensate for breakpoints when viewing the
source of a function behind a stack frame as with `source 3` etc.

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