build: remove unused label from vcbuild.bat

Remove the :wix-not-found label and harmonize the spelling of "WiX".

PR-URL: https://github.com/nodejs/node/pull/26901


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Signed-off-by: Beth Griggs <Bethany.Griggs@uk.ibm.com>