Only drop one seed, not 3 (#710)

* Fix mouse getting grabbed outside window of the game

* seedfix by changing spawnresources() & removing other branch pullrequest

* revert sln change & remove comment

Minecraft.World/StemTile.cpp

@@ -187,7 +187,7 @@ void StemTile::spawnResources(Level *level, int x, int y, int z, int data, float
 	Item *seed = NULL;
 	if (fruit == Tile::pumpkin) seed = Item::seeds_pumpkin;
 	if (fruit == Tile::melon) seed = Item::seeds_melon;
-	for (int i = 0; i < 3; i++)
+    if (seed != NULL)
     {
         popResource(level, x, y, z, shared_ptr<ItemInstance>(new ItemInstance(seed)));
     }