Tests: Fix FullClusterRestartIT.testSnapshotRestore test failing in 6.x (#27218)

We switched to using index_patterns in 6.0.0, so we need to expect index_patterns there.

Closes #27213

Author: imotov

qa/full-cluster-restart/src/test/java/org/elasticsearch/upgrades/FullClusterRestartIT.java

@@ -857,7 +857,7 @@ private void checkSnapshot(String snapshotName, int count, Version tookOnVersion
         // Check that the template was restored successfully
         map = toMap(client().performRequest("GET", "/_template/test_template"));
         expected = new HashMap<>();
-        if (runningAgainstOldCluster) {
+        if (runningAgainstOldCluster && oldClusterVersion.before(Version.V_6_0_0_beta1)) {
             expected.put("template", "evil_*");
         } else {
             expected.put("index_patterns", singletonList("evil_*"));