MaximizeComponent: Fix download location

No idea where "saveFolder" was supposed to be coming from but this
makes it use the last location or default to downloads, consistent
with the other save dialogs.

src/app/qml/NeochatMaximizeComponent.qml

@@ -139,7 +139,7 @@ Components.AlbumMaximizeComponent {
         id: saveAsDialog
         Dialogs.FileDialog {
             fileMode: Dialogs.FileDialog.SaveFile
-            currentFolder: root.saveFolder
+            currentFolder: NeoChatConfig.lastSaveDirectory.length > 0 ? NeoChatConfig.lastSaveDirectory : Core.StandardPaths.writableLocation(Core.StandardPaths.DownloadLocation)
             onAccepted: {
                 NeoChatConfig.lastSaveDirectory = currentFolder;
                 NeoChatConfig.save();