Add schema variable defintion to _processCurrentFormItemsWithDataManager function

Defintions of schema variable for all non dataLink elements in this function went missing in some refacotring. This elements shouldn´t be in this function  at all. This commit is just a hotfix.

Author: DavidPatzke

Resources/public/mapbender.element.digitizer.js

@@ -1710,7 +1710,7 @@
 
         _processCurrentFormItemsWithDataManager : function(olFeature) {
             var widget = this;
-
+            var schema = olFeature.schema;
             // dataManager access function
             // TODO: maybe it would be better to create public methods on dataManager to do this
             function withSchema(dataManager, schemaName, callback) {