Updated widget template to fix issue with admin inlines

Now we can specify separate admin widget config:
CKEDITOR_CONFIGS = {
    'default': {
        'toolbar': 'Basic',
    },
    'default_admin': {
        'toolbar': 'Basic',
        'admin_inline': True,
        'jquery_prefix': 'django.jQuery',
    }
}

Where 'admin_inline' is a flag to use another mechanism to create CKEditor widget, and optional 'jquery_prefix' is your admin jQuery prefix,'django.jQuery' for default, it is useful when you has own jQuery for django admin.