I made a mistake in rP25169 - mouse wheel hotkeys behave differently from other hotkeys (mouse button/keys) in that they are transient -> they're always pressed/released in one go.
- They shouldn't be added to the stored pressedHotkeys
- They shouldn't be added to active scancodes.
This fixes these issues & also skips un-necessary processing in those cases.
Reported by: Imarok.