Change foldr's recursive call from foldl to foldr
Change foldr's recursive call from foldl to foldr

I believe this fixes https://github.com/elm-lang/core/issues/45.
colinmccabe/core,suryagaddipati/core,deadfoxygrandpa/core,avh4/elm-lang-core,suryagaddipati/core,simonh1000/core,isaacsanders/core,rick68/core,manleyjster/core,ThomasWeiser/core,Dandandan/core,eeue56/core,martinos/core,krisajenkins/core,Dandandan/core,Pisys/core,simonh1000/core,alexiamcdonald/elm-core,isaacsanders/core,vilterp/core,laszlopandy/core,manleyjster/core,alexiamcdonald/elm-core,Pisys/core,laszlopandy/core,vilterp/core,eeue56/core,colinmccabe/core,rick68/core,rgrempel/core,krisajenkins/core,bradurani/core,rgrempel/core,bradurani/core,ThomasWeiser/core,martinos/core,deadfoxygrandpa/core,avh4/elm-lang-core