Updated MAT table assumes "CommandHeader" first member name

[jphickey]

Checklist (Please check before submitting)

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

Describe the bug
Depending on where the message definitions came from, and the type of HDR implementation used, the first element of a structure may or may not be named CommandHeader. This is controlled by the specific MsgHdr implementation that was chosen.

To Reproduce
Build the MAT using EDS-generated structs - in these (unfortunately) there is an extra layer of nesting, so this fails. The first element still is ultimately a command header.

Expected behavior
The TBL message definitions are defined by a combination of TBL itself and the MSG HDR module selection. No assumptions in HS should be made about its structure.

Code snips

HS/fsw/tables/hs_mat.c

Line 75 in 94098ef

.HsMsg.cmd1.CommandHeader =

Specifically the ".CommandHeader" part.

System observed on:
Debian

Additional context
Should be able to just remove this part of the designated initializer. Normally I would recommend use of designated initializers, but in this context it introduces a dependency/assumption that may not be correct.

Reporter Info
Joseph Hickey, Vantage Systems, Inc.