fix incorrect assignment

jme3-assetpack-support/src/com/jme3/gde/assetpack/browser/properties/SelectionPropertyEditor.java

@@ -57,7 +57,7 @@ public class SelectionPropertyEditor implements PropertyEditor {
 
     public void setValue(Object value) {
         if (value instanceof String) {
-            value = (String) value;
+            this.value = (String) value;
         }
     }