Report error when writing event log header

[skliper]

Is your feature request related to a problem? Please describe.
The return from CFE_FS_WriteHeader is checked when writing the event log header, but there's no event sent on error (it just returns CFE_EVS_FILE_WRITE_ERROR):

cFE/modules/evs/fsw/src/cfe_evs_log.c

Lines 180 to 183 in e80aae9

	/* Write the file header to the log file */
	BytesWritten = CFE_FS_WriteHeader(LogFileHandle, &LogFileHdr);
	if (BytesWritten == sizeof(LogFileHdr))

Describe the solution you'd like
Send an event to help narrow down the issue.

Describe alternatives you've considered
None

Additional context
Code review

Requester Info
Jacob Hageman - NASA/GSFC