Removes account deletion box in single-user mode

[matthewbadeau]

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Warnings

• This PR will change existing database contents.
• This PR introduces a breaking change to existing installations.

Summary

Removes account deletion box in single-user mode. Multi-user mode still lets the user delete their account.

Linked issues

Description of changes

Quick change to remove the account deletion box in single-user mode. No tests written as I'm not sure how to write frontend tests.

[codeclimate]

Code Climate has analyzed commit 92e2c33 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 87.2% (0.0% change).

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