fix(pageMeta): Don't access `document` in top-level

[cogk]

Improve compatibility with tools that set the document global to undefined while pre-rendering/SSR (e.g. Nitro).

https://stackoverflow.com/questions/46058544/document-is-not-defined-in-nuxt-js

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[netchampfaris]

@cogk

Hey are you able to use frappe-ui in a nuxt project with this change?

[netchampfaris]

https://github.com/frappe/frappe-ui/commit/7e7244d5f6f2e8929b63d31e1a12a46f06a24204