Remove broken function.

config_generator.has_argparse could not work as
`f` does not exist in scope. Furthermore, I suspect it is
probably a duplication accident, as it's very similar
to source_parser.has_argparse, which is the only one
used in the codebase.

gooey/python_bindings/config_generator.py

@@ -41,8 +41,3 @@ def create_from_parser(parser, source_path, **kwargs):
     build_spec['manual_start'] = True
 
   return build_spec
-
-
-
-def has_argparse(module_path):
-  return any(['.parse_args(' in line.lower() for line in f.readlines()])