build: fix ./configure --help format error

PR-URL: #53066
Reviewed-By: Antoine du Hamel <[email protected]>
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Juan José Arboleda <[email protected]>
Reviewed-By: Mohammed Keyvanzadeh <[email protected]>
Reviewed-By: Tierney Cyren <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Chengzhong Wu <[email protected]>

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',