fix(vscode): syntax highlighting error if type declaration at the end of script block

[zhiyuanzmj]

closed #2060

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[pkg-pr-new]

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vue-component-meta

npm i https://pkg.pr.new/vuejs/language-tools/vue-component-meta@5256

vue-component-type-helpers

npm i https://pkg.pr.new/vuejs/language-tools/vue-component-type-helpers@5256

@vue/language-core

npm i https://pkg.pr.new/vuejs/language-tools/@vue/language-core@5256

@vue/language-server

npm i https://pkg.pr.new/vuejs/language-tools/@vue/language-server@5256

@vue/language-plugin-pug

npm i https://pkg.pr.new/vuejs/language-tools/@vue/language-plugin-pug@5256

@vue/language-service

npm i https://pkg.pr.new/vuejs/language-tools/@vue/language-service@5256

vue-tsc

npm i https://pkg.pr.new/vuejs/language-tools/vue-tsc@5256

@vue/typescript-plugin

npm i https://pkg.pr.new/vuejs/language-tools/@vue/typescript-plugin@5256

commit: 596a106