QmlDesigner: Fix qbs build

Change-Id: Ia89903f687cefdc2ce98cd2f456069a631f64fe6
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/qmldesigner/qmldesignerplugin.qbs

@@ -554,7 +554,9 @@ Project {
                 "propertyeditor/qmlmodelnodeproxy.h",
                 "resources/resources.qrc",
                 "stateseditor/stateseditorimageprovider.cpp",
-                "stateseditor/stateseditoriconprovider.cpp",
+                "stateseditor/stateseditorimageprovider.h",
+                "stateseditor/stateeditorsiconprovider.cpp",
+                "stateseditor/stateseditoriconprovider.h",
                 "stateseditor/stateseditormodel.cpp",
                 "stateseditor/stateseditormodel.h",
                 "stateseditor/stateseditorview.cpp",