R1:e45ccdd89249

Fix rendering of offset-paged query panels including "Notifications"

Summary:
See <https://discourse.phabricator-community.org/t/call-to-undefined-method-phuipagerview-gethasmoreresults-in-2019-week-13/2586/>.

A small number of queries (including "Notifications" and (global) "Search") use offset-based pagers which have a slightly different API `PHUIPagerView` instead of `AphrontCursorPagerView`. This leads to a fatal in the new code for the "View All Results" buttons.

To fix this, just do an…