Manage Authors page does not show more than one page

Issue Summary

On the Manage Authors Page (Admin -> Authors), if you use the "Search By" functionality, and that results in more than one page of results, clicking the '>' or '>>' at the bottom of the page to go to the next page, results in the search filter being dropped.

Thus you can't get beyond Page 1 when using any search filters.

Steps to Reproduce

Prerequisite: Have more than one page of Authors on the Authors list. It doesn't matter if they are linked or unlinked, but you need more than one page of results.
 

1. Go to the Authors page (/admin/author/viewAuthors.action)
2. Try a filter search that returns more than one page of Authors.
3. Click on the Next Page > at the bottom.
4. Notice that the filter search is undone and you are on Page 2 of the unfiltered results.

Expected Results

It should be possible to go to page 2 that contains all the authors matched by the search filter.

Actual Results

An empty page is shown.

Workaround

• Use the bamboo-server/rest/api/latest/search/authors?searchTerm=&max-result= REST API to search the authors.
  Reference:  https://docs.atlassian.com/atlassian-bamboo/REST/8.1.1/#d2e3989

• Use a more specific search term to avoid returning two pages of authors.