rewrite.ml: drop the id returned by new_instance earlier
rewrite.ml: drop the id returned by new_instance earlier

We never use this id in rewrite.ml so don't bother threading it around.

Matafou/coq,JasonGross/coq,SkySkimmer/coq,SkySkimmer/coq,gares/coq,gares/coq,silene/coq,SkySkimmer/coq,coq/coq,SkySkimmer/coq,JasonGross/coq,coq/coq,ejgallego/coq,ejgallego/coq,Zimmi48/coq,gares/coq,Zimmi48/coq,Zimmi48/coq,gares/coq,silene/coq,ejgallego/coq,gares/coq,ejgallego/coq,silene/coq,coq/coq,coq/coq,Matafou/coq,Zimmi48/coq,JasonGross/coq,JasonGross/coq,Matafou/coq