VS2019 Support - Set VisualStudioProductVersion to VS2019 if libcef_dll_wrapper.lib otherwise fallback to VS2017
VS2019 Support - Set VisualStudioProductVersion to VS2019 if libcef_dll_wrapper.lib otherwise fallback to VS2017

Follow up to #2924

Livit/CefSharp,Livit/CefSharp,Livit/CefSharp,Livit/CefSharp