Clean up JWST Instruments

Currently, there are two modes for G395H: "F290LP.G395H" and "FS-G395H/F290LP".   The FS one isn't in use and can be deleted.

The F290LP one should be changed to "FS-G395H".

Spectra impacted:
- 2MASS J04151954-0935066
- CWISEP J193518.58-154620.3