sw-precache: don't fallback if URL starts with /api

[BDav24]

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[piotr-cz]

Without this PR, whole section Integrating with an API Backend is irrelevant for production builds.

Moreover examples in tutorials probably won't work in version v0.10+

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[piotr-cz]

To explain further: Proxy feature works in development environment but on production any requests that are not cached by service worker will resolve to index.html anyway.

So proxy feature doesn't make sense as in production you have to place API on other origin anyway.

There should be at least one exception for service worker fallback and /api/* is IMHO best one.
I just wonder how to phrase it in User Guide.

Side note: There is a PR #3419 which aims to disable navigateFallback option completely.

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