Add edge case handling for FP withdrawals

[awilliams1-cb]

As mentioned here, the current FP withdrawal logic doesn't handle edge cases that can occur during proving / finalization with fault proof enabled networks. These should be added to the withdrawer.

[Goodmoh]

2130436120 muhammadu saidu sabo UBA bank

[Goodmoh]

• _**/Duplicate of #35 **_