RouterLink isActive class not working when adding custom class attr.

[wietseva]

When a route is active, RouterLink currently does not add router-link-active class when a custom class attribute is provided.

Using JSX

<Link class="nav-item" to="route" /> 

renders

<a class="nav-item" href="/route" />

expected would be

<a class="nav-item router-link-active" href="/route" />

[wietseva]

Simply moving the the ...attrs spread to the top seems to fix this issue.

 return h(
        'a',
        {
          ...attrs,
          class: elClass.value,
          onClick: link.navigate,
          href: link.href,
        },
        slots.default && slots.default(link)
      )

#134