Fixed ghosted items in player inventory

Probable fix for ghosted items in player inventories.

Don't ask why it says I changed the whole file, before I made the commit it said I only changed 6 lines.

I added this in stop() and finish()

p1.updateInventory();
p2.updateInventory();

Note that I have not tested this, I couldn't be bothered fetching your libraries. But it should work.