Fix test that depend on bdb

mysql-test/t/ps_1general.test:
  Move disable_warnings  and it's comment to before when the statement is executed

mysql-test/t/ps_1general.test

@@ -320,13 +320,13 @@ prepare stmt4 from ' show status like ''Threads_running'' ';
 execute stmt4;
 prepare stmt4 from ' show variables like ''sql_mode'' ';
 execute stmt4;
-prepare stmt4 from ' show engine bdb logs ';
 # The output depends on the bdb being enabled and on the history
 # history (actions of the bdb engine).
 # That is the reason why, we switch the output here off.
 #   (The real output will be tested in ps_6bdb.test)
 --disable_warnings
 --disable_result_log
+prepare stmt4 from ' show engine bdb logs ';
 execute stmt4;
 --enable_result_log
 --enable_warnings