Delete duplicate headers files in src

Checklist (Please check before submitting)

[x] I reviewed the Contributing Guide.
[x] I performed a cursory search to see if the bug report is relevant, not redundant, nor in conflict with other tickets.

Describe the bug There are duplicate files "fsw/src/lc_msg.h" and "fsw/src/lc_msgdefs.h" that need to be removed.

To Reproduce View fsw directory

Expected behavior Single file of each

Code snips If applicable, add references to the software.

System observed on:

Additional context Bug introduced in https://github.com/nasa/LC/pull/56

Reporter Info Justin Figueroa, Vantage Systems

nasa / LC