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_message_source_sink.py b/python/qa_message_source_sink.py
index 1638345..8c375d4 100755
--- a/python/qa_message_source_sink.py
+++ b/python/qa_message_source_sink.py
@@ -77,4 +77,4 @@
        
         
 if __name__ == '__main__':
-    gr_unittest.run(qa_message_source_sink, "qa_message_source_sink.xml")
+    gr_unittest.run(qa_message_source_sink)