renamed dashed material definition's name to match the material name, (instead of Simple)

jme3-scenecomposer/src/com/jme3/gde/scenecomposer/gizmo/mat/dashed/dashed.j3md

@@ -1,4 +1,4 @@
-MaterialDef Simple {
+MaterialDef Dashed {
     MaterialParameters {
         Float DashSize
         Vector4 Color