Use generic method for updating status

There was a problem with showing a list with multiple users seller side.

Signed-off-by: Mihaela Martinas <martinas.mihaela21@gmail.com>
Merge branch 'master' of github.com:CoffeeTeam/AuctionHouse

Conflicts:
	src/gui/GUI.java

Signed-off-by: Mihaela Martinas <martinas.mihaela21@gmail.com>