bug#33193: vim tests break terminal output

[Royce Strange]

Hello.

Efraim Flashner said that the garbled output while building
vim disappeared when he updated it.
It has been two years and both vim and vim-full have been
updated in guix since the last comment on this issue.

Checking cuirass, there is no garbled output:
https://ci.guix.gnu.org/log/dnj9wljcck9vdwgp7dwxk00qnnk1g3c5-vim-full-8.2.0411
https://ci.guix.gnu.org/log/yajzgb2zlkklg5l9cpnsimrsjzmvq5x2-vim-8.2.0411

Building locally,
My terminal survived and didn't notice any output getting garbled.
(i am using emacs-vterm)

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$ guix --version
guix (GNU Guix) 2971ed57345ee4e00058efeaf27c6a0790fdc9dd

$ guix build vim --no-substitutes
$ guix build vim-full --no-substitutes
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Going to go ahead and close out.