MDEV-20931 fixup: innodb.import_corrtupted test cleanup

In MariaDB 10.6, ALTER TABLE t2 IMPORT TABLESPACE
will not remove the file t2.ibd on failure.

This fixes a failure of
./mtr --no-reorder innodb.import_corrupted innodb.innodb-agregate

mysql-test/suite/innodb/t/import_corrupted.test

@@ -64,5 +64,6 @@ ALTER TABLE t2 IMPORT TABLESPACE;
 
 DROP TABLE t2;
 
+--remove_file $MYSQLD_DATADIR/test/t2.ibd
 --remove_file $MYSQLD_DATADIR/test/tmp.ibd
 --remove_file $MYSQLD_DATADIR/test/tmp.cfg