Toggling Display all versions can cause pagination errors

Found while working on #1494 (closed)

1. In /process/workers, select a worker that has at least 21 worker versions without a tag.
2. Enable Display all versions so that at least two pages of worker versions are displayed.
3. Select the last page.
4. Disable Display all versions.
5. Get an Invalid page. warning.
6. Cry.