Save a default tape orientation in label settings

app/routes/labels.py

@@ -431,6 +431,10 @@ def settings():
                         (request.form.get('tape_printer_format') or '').strip())
         SiteSetting.set('tape_default',
                         request.form.get('tape_default') or tape_printer.DEFAULT_TAPE)
+        # A full settings POST always carries every field, so an absent
+        # checkbox here genuinely means unticked.
+        SiteSetting.set('tape_rotate_default',
+                        bool(request.form.get('tape_rotate_default')))
         db.session.commit()
         flash('Label settings saved.', 'success')
         return redirect(url_for('labels.settings'))
@@ -452,4 +456,5 @@ def settings():
         tape_printer_path=SiteSetting.get('tape_printer_path', '/ipp/print') or '/ipp/print',
         tape_printer_format=SiteSetting.get('tape_printer_format', '') or '',
         tape_default=SiteSetting.get('tape_default', tape_printer.DEFAULT_TAPE),
+        tape_rotate_default=SiteSetting.get_bool('tape_rotate_default', True),
     )