Quality?: Add additional check to StonksFabricHelper.instantOffer()

[nahkd123]

oh thanks god I don't have make another hotfix just to fix potential dupe glitch.

There's an ongoing dupe glitch where attacker can consume item while the screen is opened ("screen" as in container GUI). Basically you open the screen, consume the item without exiting the screen, and then click on "confirm button" to get the item listed.

Fortunately, StonksFabricHelper.placeOffer() (or something like that) already have another check to confirm that you have at least X items in inventory or $X in your account. The only thing I need to add is another check in instantOffer(), which is actually handled at menu level in instant buy menus (quick buy + confirm buy menus).