Converted super.save(args, kwargs) call to .save(*args, **kwargs)

This seems to be more in-line with code examples from django-core
e.g.

django-core/db/models/query.py
```
class ValuesQuerySet(QuerySet):
    def __init__(self, *args, **kwargs):
        super(ValuesQuerySet, self).__init__(*args, **kwargs)
```
```
    def _clone(self, *args, **kwargs):
        clone = super(ValuesListQuerySet, self)._clone(*args, **kwargs)
```
Merge pull request #2143 from Stanford-Online/jbau-model-readonly-canary-fix

Converted super.save(args, kwargs) call to .save(*args, **kwargs)