Make antique mop become janitor job reward.

[meaow589]

Since I discuss a little bit in discord and it got positive feedback so I write down here.
Suggestion:make antique mop become XP job reward for janitor 
Reason : grant a little reward for high level janitor by convert regular mop to antique one.since antique mop is not hard to find and has a little more mechanic that make more janitor has some fun thing to play so I think it should fine if we have it in game.