fix(frontends/lean/notation_cmd): initialization bug
fix(frontends/lean/notation_cmd): initialization bug

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

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