Remove page parameter for first page in SEO rel prev tags

I would like to propose that the SEO tags outputted in the `rel_next_prev_link_tags` helper skip the page parameter when referencing the first page, e.g. instead of
`<link rel="prev" href="/users?page=1">`
it should instead output
`<link rel="prev" href="/users">`
to conform with how the Kaminari paginator works when referencing the first page, as per this [line] (https://github.com/amatsuda/kaminari/blob/master/lib/kaminari/helpers/tags.rb#L28)