bug 13038: Remove support for multiple GPUs

https://cvs.khronos.org/bugzilla/show_bug.cgi?id=13038
diff --git a/layers/screenshot.cpp b/layers/screenshot.cpp
index 82c8d79..19b1d4a 100644
--- a/layers/screenshot.cpp
+++ b/layers/screenshot.cpp
@@ -140,8 +140,7 @@
         (VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT |
             VK_MEMORY_PROPERTY_HOST_UNCACHED_BIT |
             VK_MEMORY_PROPERTY_HOST_WRITE_COMBINED_BIT |
-            VK_MEMORY_PROPERTY_PREFER_HOST_LOCAL |
-            VK_MEMORY_PROPERTY_SHAREABLE_BIT)
+            VK_MEMORY_PROPERTY_PREFER_HOST_LOCAL)
     };
     const VkCmdBufferCreateInfo createCommandBufferInfo = {
         VK_STRUCTURE_TYPE_CMD_BUFFER_CREATE_INFO,