fix: align ISwap interface to Swap implementation

[charlesndalton]

No description provided.

[miguelmota]

@red-impala check out the v1 branch which is the current live implementation

contracts/contracts/saddle/Swap.sol

Line 317 in 8cefc39

function calculateRemoveLiquidity(address account, uint256 amount)

@cwhinfrey @shanefontaine wondering if we should default to v1 since it may be confusing

edit: was looking at the wrong file but the PR is still valid I think for v1 branch

[charlesndalton]

@miguelmota Ok, will create the PR on v1 since I see it has the same problem

[charlesndalton]

PR