Incorrect trajectory file referenced for Fresnel visualization

### Description

Cell 4 of ellipsoids_min_work.ipynb references a file called "ellipsoid-melt-90.gsd" which is never created in the prio HOOMD setup (Cell 2)

### Fix

Change line 
```python
    gsd_file="ellipsoid-melt-90.gsd", frame=10, view_axis=(1, 0, 0)
```
to
```python
    gsd_file="ellipsoid-melt-4mers.gsd", frame=10, view_axis=(1, 0, 0)
```