Fix custom baseURL bug effecting browserBaseURL.

[jmcmullen]

Upon changing my baseURL, the browserBaseURL was changing on the output of my statically generated site to include it. This is not good because it only needs changed when generating, not the final output. This commit fixes that issue.

Nuxtent config:

nuxtent {
    content,
    api {
        baseURL: 'http://localhost:8080',
    }
}

Before:

… debug nuxt › axios › baseURL: http://localhost:8080/content-api
… debug nuxt › axios › browserBaseURL: http://localhost:8080/_nuxt/content

After:

… debug nuxt › axios › baseURL: http://localhost:8080/content-api
… debug nuxt › axios › browserBaseURL: /_nuxt/content

[cesasol]

I took the liberty to fix your changes since the browserBaseURL was inserting into the baseURL, I tested but I would like you to test on your end to ensure this will not break any current sites

[jmcmullen]

Looking good on my end. Awesome!