Made the test innodb_max_dirty_pages_pct_func clean up after itself.


mysql-test/r/innodb_max_dirty_pages_pct_func.result:
  Updated result file.
mysql-test/t/disabled.def:
  Fixed BUG#37906
mysql-test/t/innodb_max_dirty_pages_pct_func.test:
  Made the test clean up after itself.