picto upload now is an update

sails/src/api/controllers/PictoController.js

@@ -563,7 +563,21 @@ module.exports = {
 
         if (err || (uploadedFiles.length === 0))
           return res.serverError("Error uploading " + err ? err : "");
-
+        if (req.body.id_pic!=null && req.body.id>=0) {
+            query =  {
+                id: req.body.id_pic
+            }
+            Picto.update(query, {
+              uri:pictoFileName
+            })
+            .then(updated => {              
+              return res.ok(updated);            
+            })
+            .catch(err => {
+              return res.serverError('Unable to upload picto: ' + err);
+            });
+        }
+        else
             Picto.create({
               uri: pictoFileName,
               source: 2, // 1 -> SymbolStix, 2 -> custom