[MDEV-7978] Update test cases

Adding an extra statement requires test cases update.

mysql-test/r/mysqld--help.result

@@ -1340,7 +1340,7 @@ performance-schema-max-rwlock-instances -1
 performance-schema-max-socket-classes 10
 performance-schema-max-socket-instances -1
 performance-schema-max-stage-classes 150
-performance-schema-max-statement-classes 178
+performance-schema-max-statement-classes 179
 performance-schema-max-table-handles -1
 performance-schema-max-table-instances -1
 performance-schema-max-thread-classes 50

mysql-test/suite/sys_vars/r/sysvars_server_notembedded.result

@@ -2965,9 +2965,9 @@ READ_ONLY	YES
 COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	PERFORMANCE_SCHEMA_MAX_STATEMENT_CLASSES
 SESSION_VALUE	NULL
-GLOBAL_VALUE	178
+GLOBAL_VALUE	179
 GLOBAL_VALUE_ORIGIN	COMPILE-TIME
-DEFAULT_VALUE	178
+DEFAULT_VALUE	179
 VARIABLE_SCOPE	GLOBAL
 VARIABLE_TYPE	BIGINT UNSIGNED
 VARIABLE_COMMENT	Maximum number of statement instruments.