The test 
1. did not verify that CREATE FUNCTION shall fails in a case of active binlog
   and @@log_bin_trust_function_creators is zero if there is no DETERMINISTIC qualifier
   and super user privilege;
2. contained an explit warning on that CREATE FUNCTION actually succeeded whereas
   it was supposed to fail;
3. did not demand the bin-log be set ON even though it has contained the opt file
   explictily setting the name for the binlog file.
      
Fixed 1-3 with modifying the test accordingly.


mysql-test/r/log_bin_trust_function_creators_func.result:
  Bug #41003 changed results.
mysql-test/t/log_bin_trust_function_creators_func-master.opt:
  removed unnecessary file, the specificly requested binlog file name was not used in
  the test.
mysql-test/t/log_bin_trust_function_creators_func.test:
  corrected the test that previously: 1.  did not verify that CREATE FUNCTION shall fail
  in some cases; 2. contained an explit warning on that CREATE FUNCTION actually