Update account deletion string

[marcellamaki]

Summary

Description of the change(s) you made

Updates string to more accurately display the current (if not ideal) behavior for account deletion with shared channels.

Manual verification steps performed

Create a brand new account
Create a channel and share it with someone so that they can edit it.
Go to Settings > Account and attempt to delete the account. See updated warning string.

Screenshots (if applicable)

Does this introduce any tech-debt items?

No, but it doesn't resolve the underlying problem, either

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Reviewer guidance

How can a reviewer test these changes?

Reference manual verification steps above.

References

Sort of fixes #4532 , at least as much as we can right now.

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Contributor's Checklist

PR process:

• If this is an important user-facing change, PR or related issue the CHANGELOG label been added to this PR. Note: items with this label will be added to the CHANGELOG at a later time
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• All user-facing strings are translated properly
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Reviewer's Checklist

This section is for reviewers to fill out.

• Automated test coverage is satisfactory
• PR is fully functional
• PR has been tested for accessibility regressions
• External dependency files were updated if necessary (yarn and pip)
• Documentation is updated
• Contributor is in AUTHORS.md

[AlexVelezLl]

I think we could say that they cannot delete accounts that have channels (in general), not specifically shared channels because even if they have not shared them, they still cannot delete the account.

[AlexVelezLl]

LGTM!