refactor: migrate to getCurrentInstance API

[OnlyWick]

Found a missed spot to use getCurrentInstance API instead of direct instance access.

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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/runtime-core

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@vue/reactivity

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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

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commit: 7789361

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB (-4 B)	38.1 kB (+1 B)	34.3 kB (+6 B)
vue.global.prod.js	158 kB (-4 B)	58 kB	51.6 kB (-21 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.5 kB	18.2 kB	16.7 kB
createApp	54.6 kB (+12 B)	21.3 kB (+12 B)	19.4 kB (+7 B)
createSSRApp	58.8 kB (+12 B)	23 kB (+5 B)	21 kB (+7 B)
defineCustomElement	59.4 kB (+12 B)	22.9 kB (+3 B)	20.8 kB (+5 B)
overall	68.6 kB (-2 B)	26.4 kB	24 kB (-35 B)