fix: Don't show AccountListMenu back button by default

[darkwing]

Description

A recent change (#26271) made it such that the "<" (back button) in the AccountListMenu component always shows. We do not want this when the AccountListMenu first opens, so this PR ensures that.

Related issues

Fixes:

Manual testing steps

1. Open the AccountListMenu
2. Don't see the <
3. Click the "Add account" button
4. See the <
5. Click the <, go back to main menu

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[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.

[vinnyhoward]

Pulled it down and tested it and it LGTM! Just need the type issue failing the linter resolved

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.17%. Comparing base (2f1f4d5) to head (48b77c8).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #26940      +/-   ##
===========================================
- Coverage    70.17%   70.17%   -0.00%     
===========================================
  Files         1425     1425              
  Lines        49652    49651       -1     
  Branches     13890    13890              
===========================================
- Hits         34842    34841       -1     
  Misses       14810    14810              

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[metamaskbot]

Builds ready [48b77c8]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5
  • common: 0, 1, 10, 11, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
  • ui: 0, 1, 10, 11, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (1656 ± 85 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	223	2115	1376	591	284
		domContentLoaded	1431	2105	1639	173	83
		load	1439	2114	1656	177	85
		domInteractive	12	91	33	20	10

Bundle size diffs

• background: 0 Bytes (0.00%)
• ui: -7 Bytes (-0.00%)
• common: 0 Bytes (0.00%)

[georgewrmarshall]

LGTM!

• Pulled branch checked accounts menu modal did not show back button ✅

[georgewrmarshall]

non-blocking: Should both onBack and onClose props use the same type?