This fixes a PropType error when using non-custom slippage, and it
fixes a type inconsistency when custom slippage is used.
Previously, `slippage` was being converted explicitly to a `Number` as
it was passed into `BuildQuote`, but not as it was passed into
`AwaitingSwap`. Also the PropType was set as `string`, despite the fact
that it's a number in most cases, and is used for math.
The PropType has been changed to `number`, and the selective casting to
`Number` has been removed. Instead, the `maxSlippage` value is cast to
a `Number` as it's being selected, so that the type is always
consistent.
The property `quoteDataRows[0]rawNetworkFees` was described as a number
rather than a string. In practice it is a string in all cases. The
PropType and the tests have both been updated to expect it to be a
string.
Sorting was broken for the "Quote Source" column of the quote sort
list. Attempting to sort by this column would arrange the quotes in a
seemingly random order.
It appears that this was due to this column being programmed to sort by
a property called `liquiditySource`, which does not exist in the quote
data. I'm unsure what the difference between `liquiditySource` and
`quoteSource` was supposed to be; the values in the mocks are all
identical.
All references to `liquiditySource` have been updated to refer to
`quoteSource` instead, and the sorting now works correctly.
The `metaMaskFee` property on the "quote data" PropType was not used,
and it never existed in practice. This resulted in PropType errors.
The non-existent property has been removed.
The quote list columns have been adjusted to add more space in between
the columns. Additionally, the third column cells are now better
aligned under the header. A few unnecessary `<div>`s and CSS classes
have been removed as well.