Make the base calculation in CheatsWindow simpler.

First and foremost this should test the checked state, not its direct value.
This should never have used multiplication at all. Seriously, what the hell?

The only values it would have given is true or false, so the only cases are 0*6 and 1*6.
Merge pull request #127 from lioncash/cheat-dlg-simplification

Make the base calculation in CheatsWindow simpler.