[bugfix] Fix password change keys

[tsmethurst]

Description

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If this is a documentation change, please briefly describe what you've changed and why.

Fix an issue where password couldn't be changed via the settings panel because of incorrect keys.

Checklist

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• I/we have read the GoToSocial contribution guidelines.
• I/we have discussed the proposed changes already, either in an issue on the repository, or in the Matrix chat.
• I/we have performed a self-review of added code.
• I/we have written code that is legible and maintainable by others.