scripts: Fix typo in test result parser

This validation tests print "TEST SKIPPED:" when a test is skipped, but
the script was looking for "TEST_SKIPPED:".
diff --git a/scripts/parse_test_results.py b/scripts/parse_test_results.py
index 2f996f0..ce428c5 100644
--- a/scripts/parse_test_results.py
+++ b/scripts/parse_test_results.py
@@ -128,7 +128,7 @@
             self.current_test_output = ""
 
     def skip_test_match(self, line):
-        if re.search(r'TEST_SKIPPED', line) != None:
+        if re.search(r'TEST SKIPPED', line) != None:
             self.test_results[self.current_test][self.current_profile] = "skip"
 
     def pass_test_match(self, line):