Optimize rsync command in AutoInstaller GUI for better performance

- Remove --stats and --human-readable flags from rsync command
- These flags add overhead by generating statistics and human-readable output
- Now matches the original auto-installer.sh rsync command exactly
- Should improve copy performance by reducing processing overhead
- Maintains --progress flag for dynamic progress updates in GUI

This optimizes the system copy process to match the performance
of the original auto-installer.sh script while preserving GUI progress feedback.

autoinstaller_gui/autoinstallergui.py

@@ -728,7 +728,7 @@ class InstallerWorker(QThread):
         # Exclude the target directory to prevent copying into itself
         target_exclude = f'--exclude={target_mount}'
         cmd = [
-            'rsync', '-av', '--progress', '--stats', '--human-readable',
+            'rsync', '-av', '--progress',
             target_exclude,
             '--exclude=/proc', '--exclude=/sys', '--exclude=/dev',
             '--exclude=/tmp', '--exclude=/run', '--exclude=/mnt',