Turn auto_complete_issues on by default

ee/app/views/groups/epics/show.html.haml

@@ -31,7 +31,7 @@
           iid: @epic.iid,
           full_path: @group.full_path,
           auto_complete_epics: 'true',
-          auto_complete_issues: 'false',
+          auto_complete_issues: 'true',
           user_signed_in: current_user.present? ? 'true' : 'false',
           initial: issuable_initial_data(@epic).to_json } }
   #roadmap.tab-pane

ee/changelogs/unreleased/rjain-epic-trees2.yml

+---
+title: Turn auto_complete_issues on by default
+merge_request: 20525
+author:
+type: fixed