feat(frontends/lean/server): display current option value instead of default value
feat(frontends/lean/server): display current option value instead of default value

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

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