Update VS Studio version in CDash config (fix for ctest_nightly).

CDashConfScript.cmake

@@ -10,7 +10,7 @@ if(WIN32)
 	set(CTEST_SITE "FaustWin")
 	set(CTEST_CMAKE_GENERATOR "Visual Studio 14 Win64")
 	# set above seems to be ignored
-	set(CONF_OPTIONS "${CONF_OPTIONS} -G  'Visual Studio 14 Win64' -DMATIO_INC_DIR=$ENV{MATIO_INC_DIR} -DMATIO_LIB_FILE=$ENV{MATIO_LIB_FILE}")
+	set(CONF_OPTIONS "${CONF_OPTIONS} -G  'Visual Studio 16 2019' -DMATIO_INC_DIR=$ENV{MATIO_INC_DIR} -DMATIO_LIB_FILE=$ENV{MATIO_LIB_FILE}")
 elseif(APPLE AND UNIX)
 	set (CTEST_CMAKE_GENERATOR "Unix Makefiles")
 	set(CTEST_SITE "FaustMacOS")