Moved toJSON calls to serializer

- toJSON transformations should happen on serializer level so controllers could be called directly with it's own options internally

core/server/api/canary/email.js

@@ -27,7 +27,7 @@ module.exports = {
                         });
                     }
 
-                    return model.toJSON(frame.options);
+                    return model;
                 });
         }
     },
@@ -52,8 +52,7 @@ module.exports = {
                         });
                     }
 
-                    const result = await megaService.mega.retryFailedEmail(model);
-                    return result.toJSON(frame.options);
+                    return await megaService.mega.retryFailedEmail(model);
                 });
         }
     }

core/server/api/canary/utils/serializers/output/emails.js

@@ -1,7 +1,7 @@
 module.exports = {
     read(email, apiConfig, frame) {
         frame.response = {
-            emails: [email]
+            emails: [email.toJSON(frame.options)]
         };
     },