Fix Pagination for list StackResources

The api does not support marker based pagination and this breaks
the clients which loop infinitely over list resource calls.
diff --git a/openstack/orchestration/v1/stackresources/results.go b/openstack/orchestration/v1/stackresources/results.go
index 69f21da..ea84db5 100644
--- a/openstack/orchestration/v1/stackresources/results.go
+++ b/openstack/orchestration/v1/stackresources/results.go
@@ -63,7 +63,7 @@
 // As OpenStack extensions may freely alter the response bodies of structures returned to the client, you may only safely access the
 // data provided through the ExtractResources call.
 type ResourcePage struct {
-	pagination.MarkerPageBase
+	pagination.SinglePageBase
 }
 
 // IsEmpty returns true if a page contains no Server results.