chore(reactivity): remove unnecessary array copy

[edison1105]

this change was for #5783 in #12373. it's not necessary since #5783 was fixed via 2193284

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Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	99.6 kB (-5 B)	37.8 kB (-4 B)	34.1 kB (-62 B)
vue.global.prod.js	157 kB (-5 B)	57.7 kB (-8 B)	51.4 kB (-9 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	47 kB (-5 B)	18.3 kB (-8 B)	16.7 kB (-5 B)
createApp	55.1 kB (-5 B)	21.3 kB (-10 B)	19.4 kB (-22 B)
createSSRApp	59.1 kB (-5 B)	23 kB (-9 B)	20.9 kB (-11 B)
defineCustomElement	59.9 kB (-5 B)	22.9 kB (-14 B)	20.8 kB (-7 B)
overall	68.8 kB (-5 B)	26.4 kB (-9 B)	23.9 kB (-3 B)

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@vue/compiler-core

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@vue/compiler-dom

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@vue/compiler-ssr

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@vue/compiler-sfc

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@vue/reactivity

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@vue/runtime-core

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@vue/runtime-dom

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@vue/server-renderer

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@vue/shared

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vue

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@vue/compat

``` pnpm add https://pkg.pr.new/@vue/compat@12400 ```

commit: f01054f