fix(auth): add path helper function

[sghgh1996]

In middleware.js file it checks for login route to redirect:

if (!login || ctx.route.path === login.split('?')[0]) {
      ctx.app.$auth.redirect('home')
}

the login is const { login, callback } = ctx.app.$auth.options.redirect so it is constant.
for example /login. In if condition it should split ctx.route.path and then checks it with login.
And there is another problem. In some cases the login route path is /login/. So I added a helper function
and it splits the path and remove / from the path.
the function:

const splitPath = path => {
    // remove query string
    let result = path.split('?')[0]
    // remove redundant / from the end of path
    if (result.charAt(result.length - 1) === '/') {
      result = result.slice(0, -1)
    }
    return result
}

new if condition:

if (!login || ctx.route.path === login.split('?')[0]) {
      ctx.app.$auth.redirect('home')
}

[pi0]

Thanks