Add parent windows to file dialogs

This makes sure they are properly placed and modal to the main window

src/qml/Settings/AccountEditorPage.qml

@@ -6,6 +6,7 @@ import QtQuick 2.15
 import QtQuick.Controls 2.15 as QQC2
 import QtQuick.Layouts 1.15
 import Qt.labs.platform 1.1
+import QtQuick.Window 2.15
 
 import org.kde.kirigami 2.15 as Kirigami
 import org.kde.kirigamiaddons.labs.mobileform 0.1 as MobileForm
@@ -248,6 +249,7 @@ Kirigami.ScrollablePage {
 
         OpenFileDialog {
             folder: StandardPaths.writableLocation(StandardPaths.PicturesLocation)
+            parentWindow: root.Window.window
         }
     }
 }