fix header check unused variables (#229)

fix
https://github.com/geotribu/website/actions/runs/9781240695/job/27004841024?pr=1143

Co-authored-by: gounux <[email protected]>

Author: gounux

geotribu_cli/content/header_check.py

@@ -255,8 +255,8 @@ def run(args: argparse.Namespace) -> None:
                     ):
                         msg = (
                             f"Les dimensions de l'image ne sont pas dans l'intervalle autorisé "
-                            f"(w:{args.min_image_width}-{args.max_image_width},"
-                            f"h:{args.min_image_height}-{args.max_image_height})"
+                            f"(largeur max: {args.max_image_width},"
+                            f"hauteur max: {args.max_image_height})"
                         )
                         logger.error(msg)
                         if args.raise_exceptions: