fix php int float comparaison

src/arenas/Battleship/functions.php

@@ -4,6 +4,7 @@ function is_it_possible_to_place_ships_on_grid($gridWidth,$gridHeight,$nbShipsSi
   //not a perfect solution
   $shipsArea=$nbShipsSize1 + 2 * $nbShipsSize2 + 3 * $nbShipsSize3 + 4 * $nbShipsSize4 + 5 * $nbShipsSize5 + 6 * $nbShipsSize6;
   if( $shipsArea < intval($gridHeight * $gridWidth / 2)){
+    echo "there";
     return false;
   }
   //longest ship