Merge pull request #14628 from edx/michaelyoungstrom/revert_django_setting

[WIP] Revert Django renderer change

lms/envs/common.py

@@ -2192,9 +2192,6 @@ CSRF_COOKIE_SECURE = False
 
 REST_FRAMEWORK = {
     'DEFAULT_PAGINATION_CLASS': 'openedx.core.lib.api.paginators.DefaultPagination',
-    'DEFAULT_RENDERER_CLASSES': (
-        'rest_framework.renderers.JSONRenderer',
-    ),
     'PAGE_SIZE': 10,
     'URL_FORMAT_OVERRIDE': None,
     'DEFAULT_THROTTLE_RATES': {