Tests: restore settings in on_exit to avoid leftover state

Setup + on_exit save/restore member_field_visibility and
member_field_required in member, setting, index_component and
form_error_handling tests.

test/mv_web/member_live/form_error_handling_test.exs

@@ -9,6 +9,23 @@ defmodule MvWeb.MemberLive.FormErrorHandlingTest do
   require Ash.Query
 
   describe "error handling - flash messages" do
+    setup do
+      {:ok, settings} = Mv.Membership.get_settings()
+      saved_visibility = settings.member_field_visibility || %{}
+      saved_required = settings.member_field_required || %{}
+
+      on_exit(fn ->
+        {:ok, s} = Mv.Membership.get_settings()
+
+        Mv.Membership.update_settings(s, %{
+          member_field_visibility: saved_visibility,
+          member_field_required: saved_required
+        })
+      end)
+
+      :ok
+    end
+
     @describetag :ui
     test "shows flash message when member creation fails with validation error", %{conn: conn} do
       system_actor = Mv.Helpers.SystemActor.get_system_actor()
@@ -102,15 +119,6 @@ defmodule MvWeb.MemberLive.FormErrorHandlingTest do
       assert html =~ "error" or html =~ "Error" or html =~ "Fehler" or
                html =~ "first_name" or html =~ "First name" or html =~ "can't be blank" or
                html =~ "darf nicht leer sein"
-
-      # Reset settings
-      {:ok, settings} = Mv.Membership.get_settings()
-
-      Mv.Membership.update_single_member_field(settings,
-        field: "first_name",
-        show_in_overview: true,
-        required: false
-      )
     end
 
     test "shows flash message when member update fails", %{conn: conn} do