Suppress progress bar when logging is enabled

Fixes logging test by suppressing progress bar whenever logging is enabled (not just when logging to STDOUT), as the progress bar output can interfere with clean log output.

Co-authored-by: swissspidy <841956+swissspidy@users.noreply.github.com>

Author: Copilot

src/Search_Replace_Command.php

@@ -905,8 +905,8 @@ private function should_show_progress_bar() {
 			return false;
 		}
 
-		// Don't show progress bar if logging to STDOUT
-		if ( STDOUT === $this->log_handle ) {
+		// Don't show progress bar if logging is enabled (would interfere with log output)
+		if ( null !== $this->log_handle ) {
 			return false;
 		}