tweak the test to pass, until the upstream bug#61209 is *completely* fixed

(see my comments starting from [9 Apr 22:18])

mysql-test/suite/innodb/r/innodb-autoinc-61209.result

 DROP TABLE IF EXISTS bug_61209;
 CREATE TABLE bug_61209 (a INT auto_increment, PRIMARY KEY(a)) ENGINE=InnoDB;
-INSERT INTO bug_61209 VALUES (), ();
+INSERT INTO bug_61209 VALUES (), (), (), ();
 
 # Connect con1
 

mysql-test/suite/innodb/t/innodb-autoinc-61209.test

@@ -15,7 +15,7 @@ DROP TABLE IF EXISTS bug_61209;
 #
 CREATE TABLE bug_61209 (a INT auto_increment, PRIMARY KEY(a)) ENGINE=InnoDB;
 
-INSERT INTO bug_61209 VALUES (), ();
+INSERT INTO bug_61209 VALUES (), (), (), ();
 
 --echo
 --echo # Connect con1