fix the test for windows

mysql-test/main/grant_repair.result

-call mtr.add_suppression("/mysql/user");
+call mtr.add_suppression("mysql.user");
 # switching from mysql.global_priv to mysql.user
 flush tables;
 flush privileges;

mysql-test/main/grant_repair.test

 #
 # MDEV-20257 Server crashes in Grant_table_base::init_read_record upon crash-upgrade
 #
+source include/not_embedded.inc;
 
-call mtr.add_suppression("/mysql/user");
+call mtr.add_suppression("mysql.user");
 source include/switch_to_mysql_user.inc;
 
 let mysql_datadir=`select @@datadir`;
@@ -14,6 +15,7 @@ perl;
   sysseek F, 24, O_RDWR or die "sysseek: $!";
   syswrite F, 1, 1 or die "syswrite: $!";
 EOF
+replace_result \\ /;
 flush privileges;
 
 source include/switch_to_mysql_global_priv.inc;