MDEV-34030 rpl.rpl_using_gtid_default can fail in (BB) mtr

The test's header is not written to follow strictly a correct order
of checks by mtr at test start which may lead to an error. E.g

./mtr --mysqld=--binlog-format=row rpl.rpl_using_gtid_default

to
At line 175: query 'SET GLOBAL gtid_slave_pos= ""' failed: ER_SLAVE_MUST_STOP (1198): This operation cannot be performed as you have a running slave ''; run STOP SLAVE '' first

Fixed to require the binlog format first in the test header.

mysql-test/suite/rpl/t/rpl_using_gtid_default.test

@@ -42,10 +42,9 @@
 # replication is used by default if master supports it
 #
 --source include/have_debug.inc
---source include/master-slave.inc
-
 # Format independent test so just use one
 --source include/have_binlog_format_mixed.inc
+--source include/master-slave.inc
 
 --echo #
 --echo # Slave default configuration should be Slave_Pos