fix: upgrade-insecure-requests cannot be turned off for static build

[dargmuesli]

Version

nuxt-security: 0.14.4
nuxt: 3.7.3

Reproduction Link

https://stackblitz.com/edit/github-xdxcbc?file=nuxt.config.ts

Steps to reproduce

run nuxt generate, then npx serve .output/public and inspect the content-security-policy header

What is Expected?

As it's set to false in nuxt's configuration there should be no upgrade-insecure-requests policy

What is actually happening?

There is a upgrade-insecure-requests policy.

[Baroshem]

Hey,

Thanks for reporting this issue! I have added it in the bf5d18e