Duplicate windows x86 installer to have one without architecture suffix

[raksooo]

Until we have the universal Windows installer we want to upload the x64 installer but without the architecture suffix. This is to avoid making changes to other parts of the release process in the meanwhile.

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This change is 

[linear]

DES-1274 Make buildserver uplaod .exe without architechture suffix

[dlon]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @raksooo)

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ci/buildserver-build.sh line 232 at r1 (raw file):

        pushd "$artifact_dir"
        for original_file in MullvadVPN-*-dev-*{.deb,.rpm,.exe,.pkg}; do
            new_file=$(echo "$original_file" | sed -nE "s/^(MullvadVPN-.*-dev-.*)(_amd64\.deb|_x86_64\.rpm|_arm64\.deb|_aarch64\.rpm|_x64\.exe|_arm64\.exe|\.pkg)$/\1$version_suffix\2/p")

Do we need to rename the .exe without a suffix here?