Bug#42588 system_mysql_db_fix30020 fails when run from bin dist with mtr2

 - Properly set --bindir=$path_client_bindir and --basedir=$basedir by adding %s format specifier

mysql-test/mysql-test-run.pl

@@ -1528,8 +1528,8 @@ sub mysql_fix_arguments () {
   mtr_init_args(\$args);
   mtr_add_arg($args, "--defaults-file=%s", $path_config_file);
 
-  mtr_add_arg($args, "--basedir=", $basedir);
-  mtr_add_arg($args, "--bindir=", $path_client_bindir);
+  mtr_add_arg($args, "--basedir=%s", $basedir);
+  mtr_add_arg($args, "--bindir=%s", $path_client_bindir);
   mtr_add_arg($args, "--verbose");
   return mtr_args2str($exe, @$args);
 }