tests: fix test-is-whitelisted check in run-tests

Again, look for bytes in a set of bytes objects.

tests/run-tests.py

@@ -1853,7 +1853,7 b' class TestSuite(unittest.TestSuite):'
                 result.addSkip(test, "Doesn't exist")
                 continue
 
-            if not (self._whitelist and test.name in self._whitelist):
+            if not (self._whitelist and test.bname in self._whitelist):
                 if self._blacklist and test.bname in self._blacklist:
                     result.addSkip(test, 'blacklisted')
                     continue