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.
