tests: zts-report: add openzfs#13215 to known list for FreeBSD

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes openzfs#13259

tests/test-runner/bin/zts-report.py.in

@@ -166,6 +166,7 @@ if sys.platform.startswith('freebsd'):
         'cli_root/zpool_wait/zpool_wait_trim_cancel': ['SKIP', trim_reason],
         'cli_root/zpool_wait/zpool_wait_trim_flag': ['SKIP', trim_reason],
         'link_count/link_count_001': ['SKIP', na_reason],
+        'casenorm/mixed_create_failure': ['FAIL', 13215],
     })
 elif sys.platform.startswith('linux'):
     known.update({