[Web] Do not use hard-coded params in imapsync jobs

[Web] Allow custom parameters in imapsync

data/web/js/api.js

@@ -80,11 +80,11 @@ $(document).ready(function() {
     // If clicked element #edit_selected is in a form with the same data-id as the button,
     // we merge all input fields by {"name":"value"} into api-attr
     if ($(this).closest("form").data('id') == id) {
-      var req_empty = false;
+      var invalid = false;
       $(this).closest("form").find('select, textarea, input').each(function() {
         if ($(this).prop('required')) {
           if (!$(this).val() && $(this).prop('disabled') === false) {
-            req_empty = true;
+            invalid = true;
             $(this).addClass('inputMissingAttr');
           } else {
             $(this).removeClass('inputMissingAttr');
@@ -106,7 +106,7 @@ $(document).ready(function() {
           }
         }
       });
-      if (!req_empty) {
+      if (!invalid) {
         var attr_to_merge = $(this).closest("form").serializeObject();
         var api_attr = $.extend(api_attr, attr_to_merge)
       } else {