py3: handle keyword arguments correctly in statprof.py

Differential Revision: https://phab.mercurial-scm.org/D1643

mercurial/statprof.py

@@ -922,7 +922,7 b' def main(argv=None):'
 
     load_data(path=path)
 
-    display(**displayargs)
+    display(**pycompat.strkwargs(displayargs))
 
     return 0