MDEV-13668 fixup: Remove test work-arounds

mysql-test/suite/innodb/r/innodb-index-online.result

@@ -231,7 +231,7 @@ WHERE variable_name = 'innodb_encryption_n_rowlog_blocks_encrypted');
 connection con1;
 SET DEBUG_SYNC = 'row_log_apply_before SIGNAL c2e_created WAIT_FOR dml2_done';
 SET lock_wait_timeout = 10;
-ALTER TABLE t1 DROP INDEX c2d, ADD INDEX c2e(c2),
+ALTER TABLE t1 CHANGE c2 c22 INT, DROP INDEX c2d, ADD INDEX c2e(c22),
 ALGORITHM = INPLACE;
 connection default;
 INSERT INTO t1 SELECT  80 + c1, c2, c3 FROM t1;
@@ -353,7 +353,7 @@ SET @rowlog_decrypt_1=
 WHERE variable_name = 'innodb_encryption_n_rowlog_blocks_decrypted');
 connection con1;
 SET DEBUG_SYNC = 'row_log_apply_before SIGNAL c2f_created WAIT_FOR dml3_done';
-ALTER TABLE t1 ADD INDEX c2f(c2);
+ALTER TABLE t1 ADD INDEX c2f(c22f), CHANGE c2 c22f INT;
 connection default;
 SET DEBUG_SYNC = 'now WAIT_FOR c2f_created';
 SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
@@ -392,7 +392,6 @@ SET DEBUG_SYNC = 'now SIGNAL dml3_done';
 connection con1;
 Warnings:
 Note	1831	Duplicate index `c2f`. This is deprecated and will be disallowed in a future release
-ALTER TABLE t1 CHANGE c2 c22f INT;
 SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
 name	count
 ddl_background_drop_indexes	0

mysql-test/suite/innodb/t/innodb-index-online.test

@@ -225,9 +225,7 @@ SET DEBUG_SYNC = 'row_log_apply_before SIGNAL c2e_created WAIT_FOR dml2_done';
 # Ensure that the ALTER TABLE will be executed even with some concurrent DML.
 SET lock_wait_timeout = 10;
 --send
-# FIXME: MDEV-13668
-#ALTER TABLE t1 CHANGE c2 c22 INT, DROP INDEX c2d, ADD INDEX c2e(c22),
-ALTER TABLE t1 DROP INDEX c2d, ADD INDEX c2e(c2),
+ALTER TABLE t1 CHANGE c2 c22 INT, DROP INDEX c2d, ADD INDEX c2e(c22),
 ALGORITHM = INPLACE;
 
 # Generate some log (delete-mark, delete-unmark, insert etc.)
@@ -321,9 +319,7 @@ connection con1;
 # Accumulate and apply some modification log.
 SET DEBUG_SYNC = 'row_log_apply_before SIGNAL c2f_created WAIT_FOR dml3_done';
 --send
-# FIXME: MDEV-13668
-#ALTER TABLE t1 ADD INDEX c2f(c22f), CHANGE c2 c22f INT;
-ALTER TABLE t1 ADD INDEX c2f(c2);
+ALTER TABLE t1 ADD INDEX c2f(c22f), CHANGE c2 c22f INT;
 
 connection default;
 SET DEBUG_SYNC = 'now WAIT_FOR c2f_created';
@@ -348,8 +344,6 @@ SET DEBUG_SYNC = 'now SIGNAL dml3_done';
 
 connection con1;
 reap;
-# FIXME: MDEV-13668
-ALTER TABLE t1 CHANGE c2 c22f INT;
 
 eval $innodb_metrics_select;