Fix new version dialog ui.

gpt4all-chat/qml/MyDialog.qml

@@ -7,6 +7,7 @@ import QtQuick.Layouts
 
 Dialog {
     id: myDialog
+    property alias closeButtonVisible: myCloseButton.visible
     background: Rectangle {
         width: parent.width
         height: parent.height
@@ -17,6 +18,7 @@ Dialog {
     }
 
     MyToolButton {
+        id: myCloseButton
         x: 0 + myDialog.width - myDialog.padding - width - 15
         y: 0 - myDialog.padding + 15
         z: 300

gpt4all-chat/qml/NewVersionDialog.qml

@@ -13,7 +13,8 @@ MyDialog {
     modal: true
     width: contentItem.width
     height: contentItem.height
-    padding: 10
+    padding: 20
+    closeButtonVisible: false
 
     Theme {
         id: theme