[tests] tidy up zmq_test.py

test/functional/test_runner.py

@@ -78,7 +78,7 @@ BASE_SCRIPTS= [
     'rawtransactions.py',
     'reindex.py',
     # vv Tests less than 30s vv
-    "zmq_test.py",
+    'zmq_test.py',
     'mempool_resurrect_test.py',
     'txn_doublespend.py --mineblock',
     'txn_clone.py',