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_burst_file_source.py b/python/qa_burst_file_source.py
index cf8835e..c83c9c4 100644
--- a/python/qa_burst_file_source.py
+++ b/python/qa_burst_file_source.py
@@ -101,4 +101,4 @@
             list(dst.get_burst_data()))
 
 if __name__ == '__main__':
-    gr_unittest.run(qa_burst_file_sink, "qa_burst_file_sink.xml")
+    gr_unittest.run(qa_burst_file_sink)