flatpak-run.c: valid locations, not types

Some previous g_set_error messages were related to 'unknown type', but this one about 'unknown location'. So it would probably be best to suggest 'valid locations', instead of 'valid types'.

common/flatpak-run.c

@@ -763,7 +763,7 @@ flatpak_context_verify_filesystem (const char *filesystem_and_mode,
  return TRUE;
 
  g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_FAILED,
- _("Unknown filesystem location %s, valid types are: host, home, xdg-*[/...], ~/dir, /dir"), filesystem);
+ _("Unknown filesystem location %s, valid locations are: host, home, xdg-*[/...], ~/dir, /dir"), filesystem);
  return FALSE;
 }