Fixed static cast (#8603)

Fixes #8602

src/map/clif.cpp

@@ -17030,7 +17030,7 @@ void clif_parse_CashShopReqTab(int fd, map_session_data *sd) {
 		p->items[p->count].itemId = client_nameid( item->nameid );
 		p->items[p->count].price = item->price;
 
-		p->packetLength += static_cast<decltype>(p->packetLength)>( sizeof( p->items[0] ) );
+		p->packetLength += static_cast<decltype(p->packetLength)>( sizeof( p->items[0] ) );
 		p->count++;
 	}