Fix test failure on these scrub tests.

mysql-test/suite/innodb/t/innodb_scrub_background.opt

---innodb-file-per-table=1
---innodb-file-format=Barracuda
---innodb-encrypt-tables=0
---innodb-encryption-threads=0
+--innodb_file_per_table=1 
+--innodb_file_format=Barracuda 
 --innodb-immediate-scrub-data-uncompressed=OFF 
 --innodb-background-scrub-data-uncompressed=ON 
 --innodb-background-scrub-data-compressed=ON 
 --loose-innodb-scrub-force-testing=ON
---encrypt-tmp-disk-tables=ON
---aria-encrypt-tables=ON
---innodb-encryption-threads=4
---innodb-encryption-rotate-key-age=15
---innodb-encrypt-tables=ON
---innodb-tablespaces-scrubbing
+--innodb-tablespaces_scrubbing

mysql-test/suite/innodb/t/innodb_scrub_compressed.opt

---innodb-file-per-table=1
---innodb-file-format=Barracuda
---innodb-encrypt-tables=off
+--innodb_file_per_table=1 
+--innodb_file_format=Barracuda 
 --innodb-immediate-scrub-data-uncompressed=ON 
 --innodb-background-scrub-data-uncompressed=ON 
 --innodb-background-scrub-data-compressed=ON 
 --loose-innodb-scrub-force-testing=ON 
---innodb-encryption-threads=0
---encrypt-tmp-disk-tables=ON
---aria-encrypt-tables=ON
---innodb-encryption-threads=4
---innodb-encryption-rotate-key-age=15
---innodb-encrypt-tables=ON
---innodb-tablespaces-scrubbing
-
+--innodb-tablespaces_scrubbing