fix(servernemesisdashboard): set new resolution
fix(servernemesisdashboard): set new resolution

Dashboard server metrics nemesis was updated with new panels
Need new resosultion for get full screenshot

scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests