Remove tbtcDepositToken from tbtcSystem
TBTCSystem and DepositLog hold an independent copy of  TBTCDepositToken
TbtcSystem extedns DepositLog and theref ore the variable is shodowed.
Instead of renaming and keeping both, using only the one from
DepositLog is preferable
@@ -47,7 +47,6 @@ contract TBTCSystem is Ownable, ITBTCSystem, DepositLog {
uint256 pausedTimestamp;
uint256 constant pausedDuration = 10 days;
- TBTCDepositToken tbtcDepositToken;
address public keepVendor;
address public priceFeed;
address public relay;
@@ -100,7 +99,6 @@ contract TBTCSystem is Ownable, ITBTCSystem, DepositLog {
uint256 _keepSize
) external onlyOwner {
require(!_initialized, "already initialized");
- tbtcDepositToken = TBTCDepositToken(_tbtcDepositToken);
keepVendor = _keepVendor;
VendingMachine(_vendingMachine).setExternalAddresses(
_tbtcToken,
