Powerups should not clear paid bets

[zackster]

• [ ] Write function to calculate someone's position bad on paid bets, then invoke that in the buildBettingTable function
• [ ] Go through the powerups one by one, and check to see if they reduce position sizes - if they do, call new function to assign their position size (instead of just 1)
• [ ] Update the rules and communicate the new pattern to the channel