MDEV-23659: Update Galera disabled.def file

This fix removes from the list of disabled tests all
tests that were fixed by the patch for MDEV-21770.

mysql-test/suite/galera_3nodes/disabled.def

@@ -11,11 +11,6 @@
 ##############################################################################
 
 galera_gtid_2_cluster : MDEV-23775 Galera test failure on galera_3nodes.galera_gtid_2_cluster
-galera_ipv6_mariabackup : MDEV-21770 galera_3nodes.galera_ipv6_mariabackup fails
-galera_ipv6_mariabackup_section : MDEV-21770 galera_3nodes.galera_ipv6_mariabackup fails
-galera_ipv6_mysqldump : MDEV-23576 galera_3nodes.galera_ipv6_mysqldump MTR failed: WSREP_SST: [ERROR] rsync daemon port '16008' has been taken
-galera_ipv6_rsync : MDEV-23581 galera_3nodes.galera_ipv6_rsync MTR failed: WSREP_SST: [ERROR] rsync daemon port '16008' has been taken
-galera_ipv6_rsync_section : MDEV-23580 galera_3nodes.galera_ipv6_rsync_section MTR failed: WSREP_SST: [ERROR] rsync daemon port '16008' has been taken
 galera_ist_gcache_rollover : MDEV-23578 WSREP: exception caused by message: {v=0,t=1,ut=255,o=4,s=0,sr=0,as=1,f=6,src=50524cfe,srcvid=view_id(REG,50524cfe,4),insvid=view_id(UNKNOWN,00000000,0),ru=00000000,r=[-1,-1],fs=75,nl=(}
 galera_slave_options_do :MDEV-8798
 galera_slave_options_ignore : MDEV-8798