bpo-39649: Remove obsolete check for `__args__` in bdb.Bdb.format_stack_entry (GH-18531)

Appears to be obsolete since 75bb54c3d8.

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
diff --git a/Lib/bdb.py b/Lib/bdb.py
index 7b19ba3..b18a061 100644
--- a/Lib/bdb.py
+++ b/Lib/bdb.py
@@ -548,14 +548,7 @@
             s += frame.f_code.co_name
         else:
             s += "<lambda>"
-        if '__args__' in frame.f_locals:
-            args = frame.f_locals['__args__']
-        else:
-            args = None
-        if args:
-            s += reprlib.repr(args)
-        else:
-            s += '()'
+        s += '()'
         if '__return__' in frame.f_locals:
             rv = frame.f_locals['__return__']
             s += '->'