QmlDesigner.PropertyEditor: Allow changing of id in states

Task-number: QTCREATORBUG-12499
Change-Id: I62b4418acff320978cfb282e94ae8be797509d6e
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>

share/qtcreator/qmldesigner/propertyEditorQmlSources/QtQuick/ItemPane.qml

@@ -70,7 +70,7 @@ Rectangle {
                     SecondColumnLayout {
                         LineEdit {
                             id: lineEdit
-                            enabled: isBaseState
+
                             backendValue: backendValues.id
                             placeholderText: qsTr("id")
                             text: backendValues.id.value