Fixed oauth plugin src in jade template files

Hi,

I've tried to install MediaCenterJS both from Github and NPM and both are broken in term of OAuth capabilities. It seems it dates from 18 days ago with [this commit](https://github.com/jansmolders86/mediacenterjs/commit/c0402075cc7f79f42b3e63532f20f1d60350900d) when you changed the directory structure, you did not change oauth path at the same time, which end up producing a `404` and the inhabitlity to connect to a Google account to use the Youtube App.

Hope this fixes it (it did for my local install). I haven't had a deeper look into it, there may be other path that needs some fixing that I didn't spot.

Thanks for making this app, it looks really promising.

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One question that is not related to this PR, on the website the screenshot shows integration with Google Music, is it an official and already released plugin ? It wasn't proposed on the plugin page.

One more thing, when I tried to install the Google Map plugin it failed, in the console it showed a 404 when trying to get the tagged archive from github, but I may be better of reporting this on the Google Map plugin repository.