Bug fixes, and small balance change.

Hey YOKERS! 

This update fixes the following "Bugs":

• When you have fully upgraded Workouts or Standard cards, you cannot roll an Upgrade pack in the shop.
• You can no longer roll opposite modifiers for competitions, e.g., half back gains, but double back gains.

Balance change:

• More Pain More Gain: Strength gain per Injured muscle changed from 2->1.

I'm working on more cards, unlockable difficulties (when you win), and an endless mode! Hopefully that will be ready end of next week.