test2.25: add account to local cluster

This prevents it from being added to any stray clusters and allows it to
be cleaned up easier. test21.36 wasn't destroying the created test
cluster and this account was being added to the cluster and it couldn't
delete the account on subsequent runs. test21.36 is solved now too.

testsuite/expect/test2.25

@@ -136,7 +136,8 @@ expect {
 if {[test_using_slurmdbd]} {
 	# Add test Account
 	set acct_added 0
-	spawn $sacctmgr add -i account $test_acct
+	set cluster [get_cluster_name]
+	spawn $sacctmgr add -i account $test_acct cluster=$cluster
 	expect {
 		-re "Adding Account" {
 			set acct_added 1