opt_complete_insert was improperly used by accident.
Use complete_insert flag instead.


client/mysqldump.c:
  Fix for bug #25993: mysqldump crashes with merge table and -c option
    - use complete_insert instead of opt_complete_insert.
mysql-test/r/mysqldump.result:
  Fix for bug #25993: mysqldump crashes with merge table and -c option
    - test result.
mysql-test/t/mysqldump.test:
  Fix for bug #25993: mysqldump crashes with merge table and -c option
    - test case.