Fix instead wrong call to ha_key_cmp
This is related to bug #10741 Inserting double value into utf8 column crashes server


myisam/mi_key.c:
  Revert Bar's fix as this causes changes in the key tree that could cause incompatibilites
myisam/mi_rnext_same.c:
  Fixed wrong arguments to ha_key_cmp()
  This caused a compare to fail if we first found a key with end space and then same key without end space
mysql-test/r/ctype_utf8.result:
  Additional test
mysql-test/t/ctype_utf8.test:
  Additional test