sftp: requireAdmin is true by default

for existing installs, it is off for backward compatibility

src/routes/services.js

@@ -46,7 +46,7 @@ function configure(req, res, next) {
         memorySwap: req.body.memorySwap
     };
 
-    if (req.params.service === 'sftp' && 'requireAdmin' in req.body) {
+    if (req.params.service === 'sftp') {
         if (typeof req.body.requireAdmin !== 'boolean') return next(new HttpError(400, 'requireAdmin must be a boolean'));
         data.requireAdmin = req.body.requireAdmin;
     }