PT-1556 binlog_format should be STATEMENT on master

On the master, binlog_format should be always STATEMENT on master

Resolves: #PT-1527

bin/pt-table-checksum

@@ -10052,7 +10052,6 @@ sub main {
       # instead, it should check if it's already set to STATEMENT.
       # This is becase starting with MySQL 5.1.29, changing the format
       # requires a SUPER user.
-      if ( $o->get('check-binlog-format') ) {
       if ( VersionParser->new($dbh) >= '5.1.5' ) {
          $sql = 'SELECT @@binlog_format';
          PTDEBUG && _d($dbh, $sql);
@@ -10076,7 +10075,6 @@ sub main {
             }
          }
       }
-      }
 
       # Set transaction isolation level. We set binlog_format to STATEMENT,
       # but if the transaction isolation level is set to READ COMMITTED and the