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.
