test(rxPaginate): Use of `main` pagination element

Most pages have one pagination element, but since there can be more than
one, the option remains to instantiate your own. Since the the `main`
function directly exercises the same code as `initialize`, it is
replaced in the tests.
Merge pull request #623 from Droogans/e2e-rxPaginate-main-element

test(rxPaginate): Use of `main` pagination element