Fix #2638, Use unsigned format specifier for perf marker log

[heathdutton]

Checklist (Please check before submitting)

• I reviewed the Contributing Guide.
• I signed and emailed the appropriate Contributor License Agreement to GSFC-SoftwareRelease@mail.nasa.gov and copied cfs-program@lists.nasa.gov.

Describe the contribution
Fixes #2638

The CFE_ES_WriteToSysLog call in CFE_ES_PerfLogAdd uses %d to format Marker (which is uint32, cast to unsigned int) and CFE_MISSION_ES_PERF_MAX_IDS - 1. Changed both format specifiers to %u so the format string matches the actual argument types.

Testing performed
Code review. Verified the existing unit test in es_UT.c covers the invalid marker path and does not assert on message text, so no test changes needed.

Expected behavior changes
Marker values with bit 31 set will now print as the correct unsigned value instead of a misleading negative number. No other behavior change.

System(s) tested on
Code review only (macOS does not support cFS native build)

Contributor Info
Heath Dutton