Makes that only the name of the first model is displayed in the Printjob Name textfield.

fixes #224

resources/qml/SaveButton.qml

@@ -54,10 +54,12 @@ Rectangle {
      Connections {
         target: openDialog
         onHasMesh: {
+            if(base.fileBaseName == ''){
                 base.fileBaseName = name
                 base.createFileName()
             }
         }
+    }
 
     Rectangle{
         id: printJobRow