[Code] ZoneStore Global to Singleton Cleanup (#4934)

zone/gm_commands/zone_shard.cpp

@@ -31,7 +31,7 @@ void command_zone_shard(Client *c, const Seperator *sep)
 	}
 	else {
 		// validate
-		if (!zone_store.GetZone(zone_input)) {
+		if (!ZoneStore::Instance()->GetZone(zone_input)) {
 			c->Message(Chat::White, fmt::format("Could not find zone by short_name [{}]", zone_input).c_str());
 			return;
 		}