tests: Do not specify filename when runing gr_unittest

This fixes the following warning

DEPRECATED: Using filename with gr_unittest does no longer have any effect.

Change-Id: I7d6dbc32ff794ebf2bc116fa7437062e6780b85f
diff --git a/python/qa_msg_to_tag.py b/python/qa_msg_to_tag.py
index f4b6829..b897b66 100755
--- a/python/qa_msg_to_tag.py
+++ b/python/qa_msg_to_tag.py
@@ -40,4 +40,4 @@
 
 
 if __name__ == '__main__':
-    gr_unittest.run(qa_msg_to_tag, "qa_msg_to_tag.xml")
+    gr_unittest.run(qa_msg_to_tag)