Remove explicit cast to string for DecimalField within prep_for_deserialize
Remove explicit cast to string for DecimalField within prep_for_deserialize

No longer necessary since any JSON number data has already been converted to
Decimal objects using parse_float=decimal.Decimal

hynekcer/django-salesforce,chromakey/django-salesforce,django-salesforce/django-salesforce,chromakey/django-salesforce,philchristensen/django-salesforce,django-salesforce/django-salesforce,philchristensen/django-salesforce,hynekcer/django-salesforce,philchristensen/django-salesforce,django-salesforce/django-salesforce,chromakey/django-salesforce,hynekcer/django-salesforce