backupccl: unskip restore-grants

This test was skipped because it timed out.

I believe cockroachdb#89900 is the likely cause of the timeout. Since this test
doesn't depend on the shorter closed timestamp setting, we can reset
them to make the timeout much less likely.

Fixes cockroachdb#87129

Release note: None

pkg/ccl/backupccl/testdata/backup-restore/restore-grants

@@ -1,6 +1,3 @@
-skip issue-num=87129
-----
-
 # Ensure that non-cluster restores appropriately wipes the grants on the
 # restored descriptors. Since we're not restoring the users, the users that
 # the restoring descriptors reference may not be the same users as they
@@ -11,6 +8,17 @@ skip issue-num=87129
 new-server name=s1 allow-implicit-access
 ----
 
+# TODO(ssd): We reset the closed timestamp configurables to avoid schema
+# change transactions entering a retry loop with the lease acquisition
+# transactions. See https://github.com/cockroachdb/cockroach/issues/89900
+exec-sql
+SET CLUSTER SETTING kv.closed_timestamp.target_duration = '3s';
+----
+
+exec-sql
+SET CLUSTER SETTING kv.closed_timestamp.side_transport_interval= '200ms';
+----
+
 # First, let's create some users, a database, a couple of types, some tables,
 # and a schema.
 exec-sql