MDEV-20142 encryption.innodb_encrypt_temporary_tables failed in buildbot with wrong result

Let us read both encrypted temporary tables to increase the changes of
page flushing and eviction.

mysql-test/suite/encryption/r/innodb_encrypt_temporary_tables.result

@@ -9,6 +9,9 @@ INSERT INTO t2 (f1,f2,f3) SELECT '', '', '' FROM seq_1_to_8192;
 SELECT COUNT(*) FROM t1;
 COUNT(*)
 8192
+SELECT COUNT(*) FROM t2;
+COUNT(*)
+8192
 SELECT variable_value > @old_encrypted FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_temp_blocks_encrypted';
 variable_value > @old_encrypted

mysql-test/suite/encryption/t/innodb_encrypt_temporary_tables.test

@@ -15,6 +15,8 @@ CREATE TEMPORARY TABLE t2(f1 CHAR(100), f2 CHAR(200), f3 CHAR(200))ENGINE=InnoDB
 INSERT INTO t2 (f1,f2,f3) SELECT '', '', '' FROM seq_1_to_8192;
 
 SELECT COUNT(*) FROM t1;
+SELECT COUNT(*) FROM t2;
+
 SELECT variable_value > @old_encrypted FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_temp_blocks_encrypted';