Fix some typos in applications

hiboo/application/social.py

@@ -19,7 +19,7 @@ class MastodonApplication(base.SAMLApplication):
         submit = fields.SubmitField(_('Submit'))
 
     def configure(self, form):
-        callback_uri = self.application_uri.data + "/auth/auth/callback"
+        callback_uri = form.application_uri.data + "/auth/auth/callback"
         return {
             "acs": callback_uri,
             "entityid": callback_uri,

hiboo/application/storage.py

@@ -4,7 +4,7 @@ from flask_babel import lazy_gettext as _
 
 
 @register("nextcloud")
-class SeafileApplication(base.SAMLApplication):
+class NextcloudApplication(base.SAMLApplication):
     """ NextCloud is a free alternative to many cloud vendors (storage, contacts, meetings, etc.)
     """