fix(DialogPlus): remove useless lines

tests/ui/components/dialog/DialogPlus.qml

 import QtQuick 2.7
-import QtQuick.Controls 2.0
 import QtQuick.Layouts 1.3
 import QtQuick.Window 2.2
 
-import 'qrc:/ui/components/dialog'
-import 'qrc:/ui/components/form'
-
 Window {
     default property alias contents: content.data
 
@@ -15,7 +11,6 @@ Window {
     // Required buttons.
     property alias buttons: buttons.data
 
-    id: window
     modality: Qt.WindowModal
 
     ColumnLayout {
@@ -24,14 +19,12 @@ Window {
 
         // Description.
         DialogDescription {
-            Layout.alignment : Qt.AlignTop
             Layout.fillWidth: true
             id: description
         }
 
         // Content.
         Item {
-            Layout.alignment: Qt.AlignTop
             Layout.fillHeight: true
             Layout.fillWidth: true
             id: content
@@ -39,14 +32,12 @@ Window {
 
         // Buttons.
         Item {
-            Layout.alignment: Qt.AlignTop
             Layout.fillWidth: true
             height: 100
 
             Row {
                 anchors.left: parent.left
                 anchors.leftMargin: 50
-                anchors.right: parent.right
                 anchors.verticalCenter: parent.verticalCenter
                 height: 30
                 id: buttons