fix: fix v-close-popper to function on mousedown

[kouts]

This PR fixes an issue #1013 where the v-close-popper directive wouldn't work after v5.1.

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[kouts]

@Akryum, @antfu I managed to test this PR by directly editing the code inside node_modules/floating-vue/dist/floating-vue.mjs in my project since I wasn't able to build the dev environment (maybe the CONTRIBUTING.md file needs updating?).

This is the error that I get running pnpm run docs