Vue/Style: Use passed style.test option as default instead of forcing css

[timkelty]

neutrino => neutrino.use('@neutrinojs/vue', {
    style: {
          test: /\.s?css$/,
       }
})

The vue preset changes the default for style.modulesTest, but just defaults to css extensions.
If you are already overriding the test option, chances are you'll want it to use that as a default.

Note: in the past we've used Ramda.pathOr for this kind of nested accessor. It seemed like it had been mostly yanked from middlewares, so I did it the long way :)