QmlDesigner.PropertyEditor: template LineEdit should fill layout

Change-Id: I6c537b4a2ee7feace7b0bd63430b7fc442cf81b8
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

share/qtcreator/qmldesigner/propertyEditorQmlSources/PropertyTemplates/StringEditorTemplate.template

@@ -4,4 +4,5 @@ Label {
 }
 LineEdit {
     backendValue: backendValues.%2
-}
+    Layout.fillWidth: true
\ No newline at end of file
+}

share/qtcreator/qmldesigner/propertyEditorQmlSources/PropertyTemplates/TemplateTypes.qml

 
 AutoTypes {
-    imports: [ "import HelperWidgets 2.0", "import QtQuick 2.1" ]
+    imports: [ "import HelperWidgets 2.0", "import QtQuick 2.1", "import QtQuick.Layouts 1.1" ]
 
     Type {
        typeNames: ["int"]