Fix a debug string format specifier. (#544)

## Description

Fix an issue where the wrong format specifier was used for an ASCII
string.

- [ ] Impacts functionality?
- [ ] Impacts security?
- [ ] Breaking change?
- [ ] Includes tests?
- [ ] Includes documentation?

## How This Was Tested

Observed that ID_NOT_FOUND string was properly formatted.

## Integration Instructions

N/A

MfciPkg/Library/MfciDeviceIdSupportLibSmbios/MfciDeviceIdSupportLibSmbios.c

@@ -72,7 +72,7 @@ GetOptionalStringByIndex (
     // Meet the end of strings set but Index is non-zero, or
     // found an empty string, or Index passed in was 0
     //
-    DEBUG ((DEBUG_ERROR, "SMBIOS string not found, returning \"%s\"\n", ID_NOT_FOUND));
+    DEBUG ((DEBUG_ERROR, "SMBIOS string not found, returning \"%a\"\n", ID_NOT_FOUND));
     StrSize  = sizeof (ID_NOT_FOUND);
     WhichStr = ID_NOT_FOUND;
   } else {