fix another system test tests

Author: xfalcox

spec/system/ai_helper/ai_split_topic_suggestion_spec.rb

@@ -56,7 +56,15 @@ def open_move_topic_modal
     context "when suggesting titles with AI title suggester" do
       let(:mode) { DiscourseAi::AiHelper::Assistant::GENERATE_TITLES }
       let(:titles) do
-        "<item>Pie: A delicious dessert</item><item>Cake is the best!</item><item>Croissants are delightful</item><item>Some great desserts</item><item>What is the best dessert?</item>"
+        {
+          output: [
+            "Pie: A delicious dessert",
+            "Cake is the best!",
+            "Croissants are delightful",
+            "Some great desserts",
+            "What is the best dessert?",
+          ],
+        }
       end
 
       it "opens a menu with title suggestions" do