Removing a grouping leaves grouping columns partially visible

[paoliniluis]

Describe the bug
When starting with a saved question, adding 2 groupings and then deleting one, leaves some orphan column names in the top bar, that are even functional

Logs
NA

To Reproduce

1. With the sample dataset create a new GUI question (Let's say, just click the people table and save it as People).
2. access the saved question (or refresh the page), and then add 2 group by's (name and source). Then remove one of those
3. see the column titles still populated with some groupings still visible

Expected behavior
Just see the columns that are in the groupings

Screenshots
Stats

On a 40.5 I was testing with:

Information about your Metabase Installation:

• Your browser and the version: Brave latest and Firefox 93
• Your operating system: Ubuntu 21.10
• Your databases: H2
• Metabase version: master branch and 40.5
• Metabase hosting environment: Docker
• Metabase internal database: H2

Severity
Cosmetic

Additional context
Might be a cousin of #13772, but I'm not very sure

[flamber]

This only occurs on pivoted table (old pivot table). Related #12368

1. Simple question > Sample Dataset > Products - save as "Q1"
2. Refresh browser
3. Notebook - summarize Count by Category and Vendor
4. It should automatically change to pivoted table
5. Click the data toggle in the bottom - it will show the pivoted table underneath.

[kamilmielnik]

Reproducible in 0.40.5.
Fixed in master (d35c779).
Marking as fixed in the next version (48).
Closing.