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_decryption.py b/python/qa_decryption.py
index 663471c..995a530 100755
--- a/python/qa_decryption.py
+++ b/python/qa_decryption.py
@@ -199,4 +199,4 @@
 
 
 if __name__ == '__main__':
-    gr_unittest.run(qa_decryption, "qa_decryption.xml")
+    gr_unittest.run(qa_decryption)