MDEV-22240: don't use pc.splitbrain=true on node2 in galera.galera_gcache_recover

Author: ayurchen

mysql-test/suite/galera/t/galera_gcache_recover.cnf

@@ -4,4 +4,4 @@
 wsrep_provider_options='base_port=@mysqld.1.#galera_port;gcache.recover=yes;pc.ignore_sb=true'
 
 [mysqld.2]
-wsrep_provider_options='base_port=@mysqld.2.#galera_port;gcache.recover=yes;pc.ignore_sb=true'
+wsrep_provider_options='base_port=@mysqld.2.#galera_port;gcache.recover=yes'