The MetaMask fee is shown with two percent signs on the view quote page, because the percent sign is embedded in the fee amount as well as in the localized message.
The fee amount used now comes from the API, and does not have a percent sign. The percent sign is now only in the localized message. This allows for different locales to display the percentage differently. The old hard-coded value with a percent sign embedded has been removed, as it is no longer used anywhere.
* Update txMeta after postTxBalance has been retrieved
* Use gas used from txReceipt to calculate eth received
* Return null from getSwapsTokensReceivedFromTxMeta in tokenSymbol is ETH and txReceipt is missing
* Get latest txMeta before updating it with postTxBalance in case of a swaps tx in confirmTransaction
* Lint fix
