CI failed because of time_large_gauss_combined_2d_SLSQPLSQFitter

- [ ] Revert https://github.com/astropy/astropy-benchmarks/pull/139

The log is not very helpful.

```
....time_large_gauss_combined_2d_SLSQPLSQFitter failed
...
evaluation failed :( (168.66 seconds)
##[error]Process completed with exit code 2.
```

Review astropy/astropy-benchmarks#139 and the CI run containing time_large_gauss_combined_2d_SLSQPLSQFitter. Start by checking what changed in that pull request and whether the failure is reproducible; done means either confirming that reverting it restores CI or documenting why the failure has another cause.

Written by the indexing model from the issue text.