Refactor tasks order and reordering in Habitica

[tr4nt0r]

Proposed change

• The Habitica user data already provides the data that defines the order of the tasks. This is used now to determine the order instead.
• The Habitica API endpoint for changing the position of a task already returns a list with the updated sort order. Instead of requesting a coordinator refresh, the data returned from the API is used to update the sort order. This makes it also unnecessary to move the tasks around in the coordinator, as this was done because the refresh takes some time due to a 5s debounce.
• Also a bug was fixed, where when moving a task down, it was off by one.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
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• Link to developer documentation pull request:
• Link to frontend pull request:

Checklist

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[sorgfresser]

Why are we dropping the coordinator refresh here?

[tr4nt0r]

It is not needed. The API already responds with the updated data which is then used to update the sort order in the coordinator data. This is to reduce API calls as they are pretty valuable due the heavy rate limiting. It reduces the amount of required API calls from 4 to only 1.