chore(library/definitional/equations): remove recursive from error messages
chore(library/definitional/equations): remove recursive from error messages

leanprover/lean,leanprover-community/lean,avigad/lean,avigad/lean,fgdorais/lean,Kha/lean,leanprover/lean,soonhokong/lean-windows,johoelzl/lean,leodemoura/lean,Kha/lean,fpvandoorn/lean,avigad/lean,fpvandoorn/lean,fpvandoorn/lean,digama0/lean,fgdorais/lean,leanprover-community/lean,johoelzl/lean,avigad/lean,dselsam/lean,johoelzl/lean,rlewis1988/lean,soonhokong/lean-osx,fgdorais/lean,soonhokong/lean-osx,digama0/lean,Kha/lean,dselsam/lean,digama0/lean,digama0/lean,rlewis1988/lean,avigad/lean,Kha/lean,soonhokong/lean-osx,johoelzl/lean,leodemoura/lean,leanprover-community/lean,avigad/lean,dselsam/lean,dselsam/lean,soonhokong/lean-osx,dselsam/lean,Kha/lean,leanprover/lean,fgdorais/lean,dselsam/lean,leanprover-community/lean,leanprover-community/lean,fgdorais/lean,leanprover/lean,rlewis1988/lean,fpvandoorn/lean,fpvandoorn/lean,leodemoura/lean,rlewis1988/lean,soonhokong/lean-windows,digama0/lean,fgdorais/lean,leanprover/lean,leanprover-community/lean,rlewis1988/lean,rlewis1988/lean,soonhokong/lean-windows,Kha/lean,soonhokong/lean-windows,leanprover/lean,leodemoura/lean,leodemoura/lean,digama0/lean,johoelzl/lean,soonhokong/lean-windows,soonhokong/lean-osx,fpvandoorn/lean,johoelzl/lean,leodemoura/lean