build: fix ./configure --help format error

PR-URL: #53066
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>
Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com>
Reviewed-By: Tierney Cyren <hello@bnb.im>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

configure.py

@@ -397,7 +397,7 @@
     action='store',
     dest='shared_uvwasi_libname',
     default='uvwasi',
-    help='alternative lib name to link to [default: %default]')
+    help='alternative lib name to link to [default: %(default)s]')
 
 shared_optgroup.add_argument('--shared-uvwasi-libpath',
     action='store',