ci: Don't use guioptions-k in Vim tests, clean up defaults for gui tests #1530
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This keeps it consistent with other Vim GUIs and prevent unintentional breakages, since we have enabled guioptions-k as default now in MacVim which isn't the case for other platforms.
Also, since MacVim tests are run before Vim GUI tests, there's a possibility that there are stale auto-saved states leftover that interferes with them. Usually they should not matter, but we clean them up anyway to make sure we have a consistent state to run tests from.