Borrow bugs affects all the bank

[EightNice]

Enumerating Bugs and description:

1. Increased borrow - The borrowed amount increase each time you try to borrow even if there is already an existing one and only if never made a deposit after borrowed

2. Fatal borrow - If you make a deposit with borrowed ETH, and the amount of deposit exceeds the borrowed amount this turn negative value with the difference of the exceed, then you can't borrow or deposit anymore getting Insufficient balance ! Operation aborted ! or Insufficient balance ! Deposit aborted !

Steps to reproduce the behavior:

1. Run the bank
2. Borrow a few times in a row (check how raise borrowed)
3. Make a deposit of more than the amount borrowed
4. Try to borrow or deposit

• Game version: [0.3.3b]