Change unnecessary _supplyBalanceConverted to _supplyOf can save gas

[code423n4]

Handle

WatchPug

Vulnerability details

https://github.com/code-423n4/2021-09-wildcredit/blob/c48235289a25b2134bb16530185483e8c85507f8/contracts/LendingPair.sol#L338-L339

_supplyBalanceConverted is unnecessary when fromToken and toToken are the same. Change to _supplyOf can save gas.

uint creditA   = _supplyBalanceConverted(_account, tokenA, tokenA, priceA, priceA) * colFactorA / 100e18;
uint creditB   = _supplyBalanceConverted(_account, tokenB, tokenA, priceB, priceA) * colFactorB / 100e18;

Recommendation

Change to:

uint creditA   = _supplyOf(tokenA, _account) * colFactorA / 100e18;
uint creditB   = _supplyBalanceConverted(_account, tokenB, tokenA, priceB, priceA) * colFactorB / 100e18;