If-statement never reached in `StabilityPool::_updateP()`

[DanailYordanov]

Context

StabilityPool::_updateP()

Description

The _updateP function is always called with its loss parameter being true, which means that else block is never reached.

  if (loss) {
      newProductFactor = uint256(
          DECIMAL_PRECISION - _stableCoinChangePerUnitStaked
      );
@> } else { // @audit this case is never hit
      newProductFactor = uint256(
          DECIMAL_PRECISION + _stableCoinChangePerUnitStaked
      );
  }