Fix item dropping when misclick

[Explv]

"When my bot was fishing Salmon in Barbarian Village, powerlevelling (drop) it somehow managed to click use on the last fish. Then, it got stuck trying to click on the fishing spots, it went back and forth between two of these for some time until i stepped in and solved it for it."

[Azn2000]

We could do a getInventory().isItemSelected() to check when this happens while dropping and handle it if it happens, its more a workaround than a fix, what do you guys think?

[Azn2000]

Can also happen in the GE when trying to sell stuff, couldn't reproduce, so it seems like something that can happen in all inventory clicking activities