rugnux stills: the saturation log says why a stated limit is kept

It named only a Jungfraujoch-written file, also when the limit was given with --saturation.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015CeEGgpKdfkCTJb3YNMJcu

rugnux/RugnuxStills.cpp

@@ -722,7 +722,7 @@ void Rugnux::DetectSaturation(int start_image, int images_to_process) {
     logger.Info("Saturation: the values of {} sampled frames pile up from {} - the file's limit is {}{}",
                 sample.size(), *ceiling, stated,
                 adopt ? ", so pixels from there on are treated as overloaded"
-                      : *ceiling < stated ? "; the file's is kept (written by Jungfraujoch)" : "");
+                      : *ceiling < stated ? "; the stated limit is kept (written by Jungfraujoch, or given with --saturation)" : "");
     if (adopt)
         experiment_.Detector().SaturationLimit(*ceiling);
 }