chore: fix typo for toggle timeline layer visibility

[rubjo]

Currently, the toggle shows the state of the layer after a click. In other words, it shows the opposite of the current state.

With this, the toggle shows the action when clicked.

[netlify]

✅ Deploy Preview for vue-devtools-docs canceled.

Name	Link
🔨 Latest commit	0037e2d
🔍 Latest deploy log	https://app.netlify.com/sites/vue-devtools-docs/deploys/671b3728f390640008f73c3f

[webfansplz]

Oh, my bad, this is a typo 😅. Thanks.

[pkg-pr-new]

Open in Stackblitz

@vue/devtools-applet

pnpm add https://pkg.pr.new/@vue/devtools-applet@642

@vue/devtools-core

pnpm add https://pkg.pr.new/@vue/devtools-core@642

@vue/devtools

pnpm add https://pkg.pr.new/@vue/devtools@642

@vue/devtools-api

pnpm add https://pkg.pr.new/@vue/devtools-api@642

@vue/devtools-kit

pnpm add https://pkg.pr.new/@vue/devtools-kit@642

vite-plugin-vue-devtools

pnpm add https://pkg.pr.new/vite-plugin-vue-devtools@642

commit: 0037e2d