Fixes#19928
Steps to repro:
1. Add a custom column named `customColumn1` to a table.
2. Modify the computed value for it to `{{currentIndex}}`.
3. Ensure that sorting is working for the table using `customColumn1`.
4. Go to property pane settings for this column and rename it to
`customColumn2` from its title in the property pane.
5. Ensure that sorting is working using `customColumn2`.
Actual Behavior:
Sorting isn't working using `customColumn2`.
Expected Behavior:
Sorting should work using `customColumn2`.
ba7099ce00