Adapt to upstream app.settings changes

url_image_preview/url_image_preview.py

@@ -154,7 +154,7 @@ class UrlImagePreviewPlugin(GajimPlugin):
         if GLib.mkdir_with_parents(str(self._thumb_dir), 0o700) != 0:
             log.error('Failed to create: %s', self._thumb_dir)
 
-        if app.config.get('use_kib_mib'):
+        if app.settings.get('use_kib_mib'):
             self._units = GLib.FormatSizeFlags.IEC_UNITS
         else:
             self._units = GLib.FormatSizeFlags.DEFAULT
@@ -698,7 +698,7 @@ class UrlImagePreviewPlugin(GajimPlugin):
             return
 
         FileSaveDialog(on_ok,
-                       path=app.config.get('last_save_dir'),
+                       path=app.settings.get('last_save_dir'),
                        file_name=preview.filename,
                        transient_for=app.app.get_active_window())