Fix Vulkan mesh output for tessellated quads

When selecting a draw with a tessellation evaluation shader using
layout(quads), RenderDoc would emit an "Unexpected output topology"
error.

Additional changes:

* Fixes a typo in the VK_EXT_transform_feedback name in various debug
  prints.

* Renames the "GS Out" 3D View tab in the Mesh Viewer to "GS/DS Out",
  to match the corresponding table. This affects all APIs.

qrenderdoc/Windows/BufferViewer.ui

@@ -568,7 +568,7 @@
    </widget>
    <widget class="QWidget" name="gsoutTab">
     <attribute name="title">
-     <string>GS Out</string>
+     <string>GS/DS Out</string>
     </attribute>
     <layout class="QGridLayout" name="gridLayout_4">
      <property name="leftMargin">