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_arfcn.py b/python/qa_arfcn.py
index 53c8fff..0a3cc4e 100755
--- a/python/qa_arfcn.py
+++ b/python/qa_arfcn.py
@@ -267,4 +267,4 @@
 
 
 if __name__ == '__main__':
-    gr_unittest.run(qa_arfcn, "qa_arfcn.xml")
+    gr_unittest.run(qa_arfcn)