Assertion `fixed == 1' failed

Followup patch. Test case relied on system variable that is
only available if replication is compiled in. Replaced with
variable available in all builds.

mysql-test/r/errors.result:
  Test case relied on system variable that is only available if
  replication is compiled in. Replaced with variable available in
  all builds.
mysql-test/t/errors.test:
  Test case relied on system variable that is only available if
  replication is compiled in. Replaced with variable available in
  all builds.