update super to ControlledToken in Ticket.sol

[kamescg]

code-423n4/2021-06-pooltogether-findings#77

[kamescg]

A majority of the gas optimizations included in the code audit require not using the ProxyFactory instance pattern, since the updates would need to include a constructor function.

The only applicable update was simple to change super to ControlledToken in the Ticket.sol contract.

To update balance to a view function that would require also updating "@pooltogether/yield-source-interface/contracts/IYieldSource.sol" so we should first update the interface in that repo before making changes in the core contracts.