Resolved a compile error (#2743)

src/map/battle.cpp

@@ -8582,7 +8582,7 @@ void battle_adjust_conf()
 
 #if PACKETVER > 20120000 && PACKETVER < 20130515 /* Exact date (when it started) not known */
 	if (battle_config.feature_auction) {
-		ShowWarning("conf/battle/feature.conf:feature.auction is enabled but it is not stable on PACKETVER "EXPAND_AND_QUOTE(PACKETVER)", disabling...\n");
+		ShowWarning("conf/battle/feature.conf:feature.auction is enabled but it is not stable on PACKETVER " EXPAND_AND_QUOTE(PACKETVER) ", disabling...\n");
 		ShowWarning("conf/battle/feature.conf:feature.auction change value to '2' to silence this warning and maintain it enabled\n");
 		battle_config.feature_auction = 0;
 	}