K8SPSMDB-1290: Revert custom PBM image in e2e-tests (#1848)

Author: egegunes

e2e-tests/functions

@@ -10,7 +10,7 @@ IMAGE_MONGOD_CHAIN=${IMAGE_MONGOD_CHAIN:-$'
 perconalab/percona-server-mongodb-operator:main-mongod6.0
 perconalab/percona-server-mongodb-operator:main-mongod7.0
 perconalab/percona-server-mongodb-operator:main-mongod8.0'}
-IMAGE_BACKUP=${IMAGE_BACKUP:-"perconalab/percona-server-mongodb-operator:pbm-290"}
+IMAGE_BACKUP=${IMAGE_BACKUP:-"perconalab/percona-server-mongodb-operator:main-backup"}
 SKIP_BACKUPS_TO_AWS_GCP_AZURE=${SKIP_BACKUPS_TO_AWS_GCP_AZURE:-1}
 PMM_SERVER_VER=${PMM_SERVER_VER:-"9.9.9"}
 IMAGE_PMM_CLIENT=${IMAGE_PMM_CLIENT:-"perconalab/pmm-client:dev-latest"}