layers: GH1390, Fix renderpass handle output
layers: GH1390, Fix renderpass handle output

The CV CmdBeginRenderPass validation was using the incorrect variable
to output the renderpass handle in error messages.

Change-Id: I902a04ba7009557257732e0ff65d98aa93f88f31

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools