Fix the 'is' trait_mod for 'is repr'
Fix the 'is' trait_mod for 'is repr'

This special case's breakage was only picked up by a sanity test, which
since I neglected to run them went unnoticed when fixing 'is' the first
time.

sjn/rakudo,b2gills/rakudo,awwaiid/rakudo,awwaiid/rakudo,tbrowder/rakudo,cognominal/rakudo,dankogai/rakudo,ab5tract/rakudo,paultcochrane/rakudo,lucasbuchala/rakudo,jonathanstowe/rakudo,jonathanstowe/rakudo,lucasbuchala/rakudo,cygx/rakudo,rakudo/rakudo,tony-o/rakudo,softmoth/rakudo,LLFourn/rakudo,nbrown/rakudo,ungrim97/rakudo,lucasbuchala/rakudo,Gnouc/rakudo,tony-o/rakudo,tbrowder/rakudo,sjn/rakudo,paultcochrane/rakudo,azawawi/rakudo,cygx/rakudo,azawawi/rakudo,Gnouc/rakudo,usev6/rakudo,MasterDuke17/rakudo,tbrowder/rakudo,Gnouc/rakudo,skids/rakudo,usev6/rakudo,ungrim97/rakudo,nbrown/rakudo,salortiz/rakudo,nunorc/rakudo,zostay/rakudo,Gnouc/rakudo,samcv/rakudo,labster/rakudo,skids/rakudo,ab5tract/rakudo,jonathanstowe/rakudo,jonathanstowe/rakudo,Gnouc/rakudo,salortiz/rakudo,MasterDuke17/rakudo,labster/rakudo,samcv/rakudo,azawawi/rakudo,ugexe/rakudo,usev6/rakudo,ungrim97/rakudo,awwaiid/rakudo,MasterDuke17/rakudo,sjn/rakudo,samcv/rakudo,ugexe/rakudo,salortiz/rakudo,salortiz/rakudo,labster/rakudo,ab5tract/rakudo,tony-o/rakudo,raydiak/rakudo,azawawi/rakudo,awwaiid/rakudo,samcv/rakudo,dankogai/rakudo,ugexe/rakudo,LLFourn/rakudo,zostay/rakudo,MasterDuke17/rakudo,ab5tract/rakudo,sjn/rakudo,tony-o/rakudo,dankogai/rakudo,LLFourn/rakudo,b2gills/rakudo,dankogai/rakudo,ugexe/rakudo,samcv/rakudo,raydiak/rakudo,tony-o/rakudo,rakudo/rakudo,usev6/rakudo,lucasbuchala/rakudo,softmoth/rakudo,MasterDuke17/rakudo,b2gills/rakudo,salortiz/rakudo,cognominal/rakudo,ugexe/rakudo,zostay/rakudo,labster/rakudo,tony-o/rakudo,rakudo/rakudo,MasterDuke17/rakudo,LLFourn/rakudo,awwaiid/rakudo,nbrown/rakudo,paultcochrane/rakudo,cognominal/rakudo,azawawi/rakudo,labster/rakudo,Gnouc/rakudo,LLFourn/rakudo,paultcochrane/rakudo,cognominal/rakudo,paultcochrane/rakudo,nbrown/rakudo,softmoth/rakudo,nunorc/rakudo,cognominal/rakudo,lucasbuchala/rakudo,skids/rakudo,b2gills/rakudo,usev6/rakudo,nbrown/rakudo,ungrim97/rakudo,cygx/rakudo,softmoth/rakudo,sjn/rakudo,nunorc/rakudo,nunorc/rakudo,softmoth/rakudo,ungrim97/rakudo,jonathanstowe/rakudo,cygx/rakudo,skids/rakudo,raydiak/rakudo,rakudo/rakudo,salortiz/rakudo,cygx/rakudo,raydiak/rakudo,skids/rakudo,tbrowder/rakudo,rakudo/rakudo,dankogai/rakudo,zostay/rakudo,tbrowder/rakudo,b2gills/rakudo,nbrown/rakudo,tbrowder/rakudo,labster/rakudo,rakudo/rakudo,ab5tract/rakudo