Fix access to Reb_Handle
Fix access to Reb_Handle

Due to changes in 7f81cbeba446252c70c296f6a91d9840a5ce3463, it fails to
cmopile. The REBVAL passed to the cleaner is the one in the singular
array, and it's a fully initialized Handle! (with extra.singular setup
properly), which VAL_HANDLE_* macros can be applied to.

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