Adding edit navigation button flow back to send token flow

[adonesky1]

Fixes: #11317

Explanation: While reviewing @brad-decker send slice refactor PR I found invalid logic around editing a transaction in the send flow where the recipient address and amount were switched. Upon further digging I realized this wasn't causing a visible issue because the (back to) edit option that is available for ETH transactions is not available for token transactions (where this logic would be used). This PR adds back the edit navigation button for the send-token flow and fixes the faulty logic.

Manual testing steps:

• Start to send a token (on any network, and token that is not its native asset)
• Once at the confirm screen look for the edit button in the top left corner and click it
• Edit the transaction and click forward again to confirm.
• Send the transaction and verify that the transaction sent the correct amount to the correct address

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[adonesky1]

@brad-decker can we take a look at this PR together sometime today? I've spent too much time trying to figure out whats going wrong. The navigate back to edit flow is behaving inconsistently for me

[adonesky1]

@brad-decker with the fix you added for the gasLoading issue this PR appears to be working as I expect it to. Take a look when you have chance?

[metamaskbot]

Builds ready [8120baa]

• builds: chrome, firefox, opera
• bundle viz: background, ui, inpage, contentscript, ui-libs, bg-libs, phishing-detect
• build viz: Build System
• code coverage: Report
• storybook: Storybook
• all artifacts

Page Load Metrics (627 ± 34 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	45	100	65	12	6
		domContentLoaded	413	757	625	72	35
		load	415	758	627	72	34
		domInteractive	413	757	625	72	34

[brad-decker]

💯 works like a charm!

[metamaskbot]

Builds ready [d302637]

• builds: chrome, firefox, opera
• bundle viz: background, ui, inpage, contentscript, ui-libs, bg-libs, phishing-detect
• build viz: Build System
• code coverage: Report
• storybook: Storybook
• all artifacts

Page Load Metrics (546 ± 41 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	43	70	58	9	4
		domContentLoaded	379	653	544	85	41
		load	381	653	546	85	41
		domInteractive	379	652	544	85	41