test/binding: inherit Pipeline from NonDispHandle

This also assumes VkPipeline does not require any VkDeviceMemory.
diff --git a/tests/vkrenderframework.cpp b/tests/vkrenderframework.cpp
index 10722e9..8f3eeeb 100644
--- a/tests/vkrenderframework.cpp
+++ b/tests/vkrenderframework.cpp
@@ -1469,7 +1469,7 @@
 
 void VkCommandBufferObj::BindPipeline(VkPipelineObj &pipeline)
 {
-    vkCmdBindPipeline( obj(), VK_PIPELINE_BIND_POINT_GRAPHICS, pipeline.obj() );
+    vkCmdBindPipeline( obj(), VK_PIPELINE_BIND_POINT_GRAPHICS, pipeline.handle() );
 }
 
 void VkCommandBufferObj::BindDescriptorSet(VkDescriptorSetObj &descriptorSet)