Can't reset binning on join columns to "Don't bin"

[willbryant]

Describe the bug

When adding a join to a question and choosing a date field, it will by default bin the date field by month. You can change the binning, but trying to change to the "Don't bin" option doesn't work - the current binning sticks.

To Reproduce

1. Go to 'New' > 'Question'
2. Choose the Sample Database and any table with a date field, such as Accounts
3. Add a join to the same table and choose the 'Created At' date field on both sides of the criteria
4. Change the 'Created At' grouping to 'Day'; this works
5. Change the 'Created At' grouping to 'Day of month' (from the More menu); this works
6. Change the 'Created At' grouping to 'Don't bin'; this is ignored and 'Day of month' remains

Expected behavior

Changing the binning to "Don't bin" should work.

Logs

No response

Information about your Metabase installation

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    "java.vm.name": "OpenJDK 64-Bit Server VM",
    "java.vm.version": "11.0.23+9",
    "os.name": "Linux",
    "os.version": "5.10.215-203.850.amzn2.x86_64",
    "user.language": "en",
    "user.timezone": "Pacific/Auckland"
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  "metabase-info": {
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    "hosting-env": "unknown",
    "application-database": "postgres",
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Severity

Moderate

Additional context

No response