We are phasing out 32-bit support, so let's not install a shortcut for it by default.
Users can still access it via the mingw32.exe directly if needed.
This way they are hidden right away when the installer is
started and not after the first next click.
We have to take care here to not hide pages used by the uninstaller
though.
We haven't supported 32bit in a long time, so remove anything
referencing it.
Also remove the "64bit" tag from all names/titles/descriptions to avoid
implying that there is a different variant of the installer available.