layers: Rename ambiguous 'wsi_enabled' to 'surface_enabled' in PV

Signed-off-by: Chris Forbes <chrisforbes@google.com>
diff --git a/layers/parameter_validation_utils.h b/layers/parameter_validation_utils.h
index be27cbf..a3aa113 100644
--- a/layers/parameter_validation_utils.h
+++ b/layers/parameter_validation_utils.h
@@ -73,7 +73,7 @@
 
 // Enables for display-related instance extensions
 struct instance_extension_enables {
-    bool wsi_enabled;
+    bool surface_enabled;
     bool xlib_enabled;
     bool xcb_enabled;
     bool wayland_enabled;