fix: Allow users to remove linea from networks list

[gambinish]

Description

Users should be allowed to remove Linea from networks list

Related issues

Fixes: https://consensyssoftware.atlassian.net/browse/MMASSETS-387

Manual testing steps

1. Go to networks list, ensure that you can remove linea, even though it is a default network.

Screenshots/Recordings

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.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[metamaskbot]

Builds ready [8c9bf20]

• builds: chrome, firefox
• builds (beta): chrome
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• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
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• mv2: E2e Actions Stats
• code coverage: Report
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• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6
  • 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 (1848 ± 127 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	280	2266	1659	517	248
		domContentLoaded	1458	2256	1813	260	125
		load	1466	2266	1848	264	127
		domInteractive	24	82	41	19	9

Bundle size diffs

• background: 0 Bytes (0.00%)
• ui: -39 Bytes (-0.00%)
• common: 0 Bytes (0.00%)