Fixed item removal in RODEX (#4332)

Fixes #4317

Thanks to @voyfmyuh

src/map/clif.cpp

@@ -15874,7 +15874,17 @@ void clif_mail_removeitem( struct map_session_data* sd, bool success, int index,
 	WFIFOB(fd, 2) = success;
 	WFIFOW(fd, 3) = index;
 	WFIFOW(fd, 5) = amount;
-	WFIFOW(fd, 7) = 0; // TODO: which weight? item weight? removed weight? remaining weight?
+
+	int total = 0;
+	for( int i = 0; i < MAIL_MAX_ITEM; i++ ){
+		if( sd->mail.item[i].nameid == 0 ){
+			break;
+		}
+
+		total += sd->mail.item[i].amount * ( sd->inventory_data[sd->mail.item[i].index]->weight / 10 );
+	}
+
+	WFIFOW(fd, 7) = total;
 	WFIFOSET(fd, 9);
 }