Adding media_type in JWTAuthentication

[lizn520]

The drf render BrowsableAPIRenderer is requiring
a media_type object when generating a generic form
that includes a content type field, error will occur
if JWTAuthentication class does't have media_type.

[lizn520]

Error occur in D:\Python\Python39\lib\site-packages\rest_framework\renderers.py

class BrowsableAPIRenderer(BaseRenderer):
...
def get_raw_data_form(self, data, view, method, request):
...
# Generate a generic form that includes a content type field,
# and a content field.
media_types = [parser.media_type for parser in view.parser_classes]
choices = [(media_type, media_type) for media_type in media_types]
initial = media_types[0]
...

[Andrew-Chen-Wang]

Thanks for this!