Fix CURFS.id when files are added after first load
Fix CURFS.id when files are added after first load

Fixes spectest failures from caching too aggressively.

This also returns to using a cached `$!id`
tony-o/rakudo,tbrowder/rakudo,salortiz/rakudo,Gnouc/rakudo,labster/rakudo,salortiz/rakudo,tony-o/rakudo,tbrowder/rakudo,nbrown/rakudo,MasterDuke17/rakudo,salortiz/rakudo,Gnouc/rakudo,MasterDuke17/rakudo,softmoth/rakudo,labster/rakudo,labster/rakudo,softmoth/rakudo,rakudo/rakudo,nbrown/rakudo,tony-o/rakudo,tbrowder/rakudo,Gnouc/rakudo,tbrowder/rakudo,rakudo/rakudo,tony-o/rakudo,softmoth/rakudo,rakudo/rakudo,tbrowder/rakudo,softmoth/rakudo,Gnouc/rakudo,rakudo/rakudo,labster/rakudo,nbrown/rakudo,tony-o/rakudo,Gnouc/rakudo,MasterDuke17/rakudo,MasterDuke17/rakudo,rakudo/rakudo,nbrown/rakudo,labster/rakudo,nbrown/rakudo,labster/rakudo,Gnouc/rakudo,salortiz/rakudo,salortiz/rakudo,rakudo/rakudo,MasterDuke17/rakudo,nbrown/rakudo,tbrowder/rakudo,MasterDuke17/rakudo,softmoth/rakudo,salortiz/rakudo,tony-o/rakudo