scripts: Add missing newline in param val gen

Before this change, trying to update the latest known good vulkan headers
produces compiler errors because the parameter validation generator code
ends up with constant defined on the same line as the endif comment.

Change-Id: I36e6bf4ced40a6e3e0c285226fa23bfb3453c915
diff --git a/layers/generated/parameter_validation.cpp b/layers/generated/parameter_validation.cpp
index 7953aa5..dce16fd 100644
--- a/layers/generated/parameter_validation.cpp
+++ b/layers/generated/parameter_validation.cpp
@@ -199,6 +199,7 @@
 const std::vector<VkFullScreenExclusiveEXT> AllVkFullScreenExclusiveEXTEnums = {VK_FULL_SCREEN_EXCLUSIVE_DEFAULT_EXT, VK_FULL_SCREEN_EXCLUSIVE_ALLOWED_EXT, VK_FULL_SCREEN_EXCLUSIVE_DISALLOWED_EXT, VK_FULL_SCREEN_EXCLUSIVE_APPLICATION_CONTROLLED_EXT, };
 #endif // VK_USE_PLATFORM_WIN32_KHR
 
+
 bool StatelessValidation::ValidatePnextStructContents(const char *api_name, const ParameterName &parameter_name, const VkBaseOutStructure* header) {
     bool skip = false;
     switch(header->sType) {