trigger tests, to match build_table_filename behavior.


mysql-test/t/ps_1general.test:
  Adjust how the datadir file name is normalized, to match new
  build_table_filename behavior.  This fixes the test result
  when run with the embedded server.
mysql-test/t/trigger.test:
  Adjust how the datadir file name is normalized, to match new
  build_table_filename behavior.  This fixes the test result
  when run with the embedded server.