fix(frontends/lua): remove unnecessary function reference
fix(frontends/lua): remove unnecessary function reference

Signed-off-by: Leonardo de Moura <7610bae85f2b530654cc716772f1fe653373e892@microsoft.com>

soonhokong/lean,leanprover-community/lean,rlewis1988/lean,levnach/lean,sp3ctum/lean,soonhokong/lean,soonhokong/lean-windows,avigad/lean,Kha/lean,UlrikBuchholtz/lean,eigengrau/lean,leanprover/lean,htzh/lean,dselsam/lean,Kha/lean,soonhokong/lean,sp3ctum/lean,c-cube/lean,fpvandoorn/lean,digama0/lean,dselsam/lean,leanprover-community/lean,htzh/lean,fpvandoorn/lean2,c-cube/lean,codyroux/lean0.1,digama0/lean,javra/lean,soonhokong/lean-windows,Kha/lean,avigad/lean,dselsam/lean,fpvandoorn/lean2,soonhokong/travis_test,soonhokong/lean-windows,fgdorais/lean,UlrikBuchholtz/lean,fgdorais/lean,javra/lean,javra/lean,fpvandoorn/lean2,sp3ctum/lean,eigengrau/lean,soonhokong/lean-osx,rlewis1988/lean,leanprover/lean,fpvandoorn/lean,levnach/lean,johoelzl/lean,javra/lean,codyroux/lean0.1,javra/lean,levnach/lean,rlewis1988/lean,c-cube/lean,digama0/lean,leanprover-community/lean,fgdorais/lean,levnach/lean,soonhokong/lean,soonhokong/lean-osx,dselsam/lean,fpvandoorn/lean,johoelzl/lean,leodemoura/lean,leodemoura/lean,htzh/lean,soonhokong/lean-osx,soonhokong/lean,soonhokong/travis_test,avigad/lean,leodemoura/lean,sp3ctum/lean,digama0/lean,johoelzl/lean,Kha/lean,leodemoura/lean,dselsam/lean,leanprover-community/lean,fpvandoorn/lean,fpvandoorn/lean,fpvandoorn/lean,leanprover/lean,johoelzl/lean,soonhokong/lean-windows,codyroux/lean0.1,leanprover-community/lean,UlrikBuchholtz/lean,leanprover-community/lean,UlrikBuchholtz/lean,eigengrau/lean,htzh/lean,avigad/lean,leanprover/lean,leodemoura/lean,eigengrau/lean,digama0/lean,soonhokong/lean-osx,johoelzl/lean,digama0/lean,rlewis1988/lean,Kha/lean,sp3ctum/lean,levnach/lean,avigad/lean,leanprover/lean,eigengrau/lean,leanprover/lean,fpvandoorn/lean2,c-cube/lean,fpvandoorn/lean2,rlewis1988/lean,soonhokong/lean-windows,johoelzl/lean,leodemoura/lean,soonhokong/lean-osx,fgdorais/lean,soonhokong/travis_test,UlrikBuchholtz/lean,c-cube/lean,Kha/lean,fgdorais/lean,codyroux/lean0.1,soonhokong/travis_test,avigad/lean,htzh/lean,rlewis1988/lean,dselsam/lean,fgdorais/lean