Add missing `listEpicsPath` used by epics filter

ee/app/assets/javascripts/epics_list/epics_list_bundle.js

@@ -36,6 +36,7 @@ export default function initEpicsList({ mountPointSelector }) {
     epicsCountClosed,
     epicsCountAll,
     epicNewPath,
+    listEpicsPath,
     groupFullPath,
     groupLabelsPath,
     groupMilestonesPath,
@@ -71,6 +72,7 @@ export default function initEpicsList({ mountPointSelector }) {
         [IssuableStates.All]: parseInt(epicsCountAll, 10),
       },
       epicNewPath,
+      listEpicsPath,
       groupFullPath,
       groupLabelsPath,
       groupMilestonesPath,

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

@@ -14,6 +14,7 @@
       closed: issuables_count_for_state(:epic, :closed),
       all: issuables_count_for_state(:epic, :all) },
     epic_new_path: new_group_epic_url(@group),
+    list_epics_path: group_epics_path(@group),
     group_full_path: @group.full_path,
     group_labels_path: group_labels_path(@group, format: :json),
     group_milestones_path: group_milestones_path(@group, format: :json),