config/runtime/kunit.jinja2: fix result map

Fix result map for skipped tests. Initially, API
didn't have `skip` available node result in the schema.
That's why it was mapped to `None` result. But now API
has `skip` result to denote skipped tests.
Fix the result mapping accordingly.

Signed-off-by: Jeny Sadadia <[email protected]>

config/runtime/kunit.jinja2

@@ -19,7 +19,7 @@ import kernelci.api.helper
 RESULT_MAP = {
     'PASS': 'pass',
     'FAIL': 'fail',
-    'SKIP': None,
+    'SKIP': 'skip',
 }
 ARCH = '{{ arch }}'
 {% endblock %}