More lenient check for unrendered timelapses

Only delete automatically if modification AND creation date are older
than the calculated cutoff.

src/octoprint/timelapse.py

@@ -194,7 +194,8 @@ def delete_old_unrendered_timelapses():
 				if prefix in prefixes_to_clean:
 					continue
 
-				if entry.stat().st_mtime < cutoff:
+				# delete if both creation and modification time are older than the cutoff
+				if max(entry.stat().st_ctime, entry.stat().st_mtime) < cutoff:
 					prefixes_to_clean.append(prefix)
 			except:
 				if logging.getLogger(__name__).isEnabledFor(logging.DEBUG):