Fixed a syntax error

GameMap.py

@@ -21,7 +21,7 @@ class GameMap:
         if (x <= self.max_size_x and y <= self.max_size_y) and (x >= 0 and y >= 0):
             if (x, y) not in self.data:
                 self.data[(x,y)] = player
-                player.add_mark((x,y))
+                player.add_mark(x,y)
             else:
                 errorMessage = "The mark is already busy by the Player " + str(self.data[(x, y)].get_name())
                 raise KeyError(errorMessage)