If password keychain helper is enabled, always sync password stored in keychain when password is changed

[nyalldawson]

This used to be a separate menu action that the user had to remember to run. Let's err on the side of being helpful and assume that if the user is storing the password in their keychain, then they want that stored password always to be the correct one.

[benoitdm-oslandia]

LGTM

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[github-actions]

While we hate to see this happen, this PR has been automatically closed because it has not had any activity in the last 21 days. If this pull request should be reconsidered, please follow the guidelines in the previous comment and reopen this pull request. Or, if you have any further questions, just ask! We love to help, and if there's anything the QGIS project can do to help push this PR forward please let us know how we can assist.

[dokterbob]

LGTM

Why's this not merged?