BorrowingVault withdraw paused blocks liquidations

[0xdcota]

In the BorrowingVault during the liquidate() call, we check that gainedShares are not more than the liquiated owner existing shares.
However, in case vault's withdrawals are paused, the existingShares will return zero.

fuji-v2/packages/protocol/src/vaults/borrowing/BorrowingVault.sol

Lines 863 to 873 in c22c3d3

	uint256 gainedAssets = Math.mulDiv(debtToCover, 10 ** _asset.decimals(), discountedPrice);
	gainedShares = convertToShares(gainedAssets);
	_payback(caller, owner, debtToCover, debtSharesToCover);
	// Ensure liquidator receives no more shares than 'owner' owns.
	uint256 existingShares = maxRedeem(owner);
	if (gainedShares > existingShares) {
	gainedShares = existingShares;
	}

fuji-v2/packages/protocol/src/abstracts/BaseVault.sol

Lines 276 to 281 in c22c3d3

	function maxRedeem(address owner) public view override returns (uint256) {
	if (paused(VaultActions.Withdraw)) {
	return 0;
	}
	return convertToShares(maxWithdraw(owner));
	}