layers:Rename DESCRIPTOR_POOL_NODE to *_STATE

Continuing the NODE->STATE renaming effort
diff --git a/layers/descriptor_sets.h b/layers/descriptor_sets.h
index 2ea8388..11ba9a3 100644
--- a/layers/descriptor_sets.h
+++ b/layers/descriptor_sets.h
@@ -273,7 +273,7 @@
                                     const core_validation::layer_data *, AllocateDescriptorSetsData *);
 // Update state based on allocating new descriptorsets
 void PerformAllocateDescriptorSets(const VkDescriptorSetAllocateInfo *, const VkDescriptorSet *, const AllocateDescriptorSetsData *,
-                                   std::unordered_map<VkDescriptorPool, DESCRIPTOR_POOL_NODE *> *,
+                                   std::unordered_map<VkDescriptorPool, DESCRIPTOR_POOL_STATE *> *,
                                    std::unordered_map<VkDescriptorSet, cvdescriptorset::DescriptorSet *> *,
                                    const core_validation::layer_data *);