fix: repeatable --exclude option

[fregante]

Description

• Fixes Error: Expected a single value for option --exclude <glob>, received ["a/*", "b/*"] vitest-dev/vitest#5779

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[fregante]

I followed the previous related PR:

• fix: repeatable --project option vitest-dev/vitest#5265

[sheremet-va]

Is there any reason why it's open into a fork of Vitest, and not actual Vitest?

[fregante]

Darn it. I'll send another PR later, sorry 😅