Fix filter count on epic board lists

ee/app/assets/javascripts/boards/graphql/epic_board_lists.query.graphql

 #import "./epic_board_list.fragment.graphql"
 
-query ListEpics($fullPath: ID!, $boardId: BoardsEpicBoardID!) {
+query ListEpics($fullPath: ID!, $boardId: BoardsEpicBoardID!, $filters: EpicFilters) {
   group(fullPath: $fullPath) {
     board: epicBoard(id: $boardId) {
-      lists {
+      lists(epicFilters: $filters) {
         nodes {
           ...EpicBoardListFragment
         }

ee/spec/features/epic_boards/epic_boards_spec.rb

@@ -234,6 +234,7 @@ RSpec.describe 'epic boards', :js do
 
       wait_for_requests
 
+      expect(list_header(label_list)).to have_content('0')
       expect(page).not_to have_content('Epic1')
       expect(page).to have_content('Epic2')
       expect(page).to have_content('Epic3')
@@ -250,6 +251,7 @@ RSpec.describe 'epic boards', :js do
 
       wait_for_requests
 
+      expect(list_header(label_list)).to have_content('1')
       expect(page).to have_content('Epic1')
       expect(page).not_to have_content('Epic2')
       expect(page).not_to have_content('Epic3')
@@ -266,6 +268,7 @@ RSpec.describe 'epic boards', :js do
 
       wait_for_requests
 
+      expect(list_header(label_list)).to have_content('1')
       expect(page).to have_content('Epic1')
       expect(page).not_to have_content('Epic2')
       expect(page).not_to have_content('Epic3')
@@ -282,6 +285,7 @@ RSpec.describe 'epic boards', :js do
 
       wait_for_requests
 
+      expect(list_header(label_list)).to have_content('0')
       expect(page).not_to have_content('Epic1')
       expect(page).to have_content('Epic2')
       expect(page).to have_content('Epic3')
@@ -296,6 +300,7 @@ RSpec.describe 'epic boards', :js do
 
       wait_for_requests
 
+      expect(list_header(label_list)).to have_content('1')
       expect(page).to have_content('Epic1')
       expect(page).not_to have_content('Epic2')
       expect(page).not_to have_content('Epic3')