Revert "fix card::is_can_be_special_summoned()"

This reverts commit 26475352.

card.cpp

@@ -3164,7 +3164,7 @@ int32 card::is_can_be_special_summoned(effect* reason_effect, uint32 sumtype, ui
 	if((data.type & TYPE_PENDULUM) && current.location == LOCATION_EXTRA && (current.position & POS_FACEUP)
 		&& (sumtype == SUMMON_TYPE_FUSION || sumtype == SUMMON_TYPE_SYNCHRO || sumtype == SUMMON_TYPE_XYZ))
 		return FALSE;
-	if(pduel->game_field->check_unique_onfield(this, toplayer, LOCATION_MZONE))
+	if(((sumpos & POS_FACEDOWN) == 0) && pduel->game_field->check_unique_onfield(this, toplayer, LOCATION_MZONE))
 		return FALSE;
 	sumtype |= SUMMON_TYPE_SPECIAL;
 	if((sumplayer == 0 || sumplayer == 1) && !pduel->game_field->is_player_can_spsummon(reason_effect, sumtype, sumpos, sumplayer, toplayer, this))