chore(reactivity): remove unnecessary array copy

[edison1105]

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

[github-actions]

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)

[pkg-pr-new]

Open in Stackblitz

@vue/compiler-core

pnpm add https://pkg.pr.new/@vue/compiler-core@12400

@vue/compiler-dom

pnpm add https://pkg.pr.new/@vue/compiler-dom@12400

@vue/compiler-ssr

pnpm add https://pkg.pr.new/@vue/compiler-ssr@12400

@vue/compiler-sfc

pnpm add https://pkg.pr.new/@vue/compiler-sfc@12400

@vue/reactivity

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

@vue/runtime-core

pnpm add https://pkg.pr.new/@vue/runtime-core@12400

@vue/runtime-dom

pnpm add https://pkg.pr.new/@vue/runtime-dom@12400

@vue/server-renderer

pnpm add https://pkg.pr.new/@vue/server-renderer@12400

@vue/shared

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

vue

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

@vue/compat

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

commit: f01054f