MDEV-21578 : CREATE OR REPLACE TRIGGER in Galera cluster not replicating

While doing TOI buffer OR REPLACE option was not added to replicated
string.

mysql-test/suite/galera/r/galera_trigger.result

+CREATE TABLE IF NOT EXISTS t1 (id int(10) not null primary key) engine=innodb;
+CREATE OR REPLACE TRIGGER tr1
+BEFORE INSERT ON t1 FOR EACH ROW
+BEGIN
+SET NEW.id = 100;
+END|
+INSERT INTO t1 VALUES (1);
+SELECT * from t1;
+id
+100
+CREATE OR REPLACE TRIGGER tr1
+BEFORE INSERT ON t1 FOR EACH ROW
+BEGIN
+SET NEW.id = 200;
+END|
+connection node_2;
+SET SESSION wsrep_sync_wait=15;
+SELECT * FROM t1;
+id
+100
+INSERT INTO t1 values (2);
+SELECT * FROM t1;
+id
+100
+200
+connection node_1;
+SELECT * FROM t1;
+id
+100
+200
+DROP TRIGGER tr1;
+DROP TABLE t1;

mysql-test/suite/galera/t/galera_trigger.test

+--source include/galera_cluster.inc
+#
+# MDEV-21578 CREATE OR REPLACE TRIGGER in Galera cluster not replicating
+#
+CREATE TABLE IF NOT EXISTS t1 (id int(10) not null primary key) engine=innodb;
+--delimiter |
+CREATE OR REPLACE TRIGGER tr1
+BEFORE INSERT ON t1 FOR EACH ROW
+BEGIN
+SET NEW.id = 100;
+END|
+--delimiter ;
+
+INSERT INTO t1 VALUES (1);
+SELECT * from t1;
+
+--delimiter |
+CREATE OR REPLACE TRIGGER tr1
+BEFORE INSERT ON t1 FOR EACH ROW
+BEGIN
+SET NEW.id = 200;
+END|
+--delimiter ;
+
+--connection node_2
+SET SESSION wsrep_sync_wait=15;
+SELECT * FROM t1;
+INSERT INTO t1 values (2);
+SELECT * FROM t1;
+
+--connection node_1
+SELECT * FROM t1;
+
+DROP TRIGGER tr1;
+DROP TABLE t1;
+

sql/wsrep_mysqld.cc

@@ -2924,7 +2924,12 @@ static int wsrep_create_trigger_query(THD *thd, uchar** buf, size_t* buf_len)
     definer_host.length= 0;
   }
 
-  stmt_query.append(STRING_WITH_LEN("CREATE "));
+  const LEX_STRING command[3]=
+      {{ C_STRING_WITH_LEN("CREATE ") },
+       { C_STRING_WITH_LEN("ALTER ") },
+       { C_STRING_WITH_LEN("CREATE OR REPLACE ") }};
+  stmt_query.append(command[thd->lex->create_view_mode].str,
+                    command[thd->lex->create_view_mode].length);
 
   append_definer(thd, &stmt_query, &definer_user, &definer_host);