chore: allow deletion of selected network

[Teng-Web3]

Explanation

The Global Network Selector is being removed In the new version of extension, we can select muti active networks, so we can remove any of them including the current(selected) one.

References

Fix : #6162
Related to: MetaMask/metamask-extension#34457

Changelog

After change

after_change.mp4

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes