Demo: fixed a misuse of EndChildFrame(). (#6496)

imgui_demo.cpp

@@ -8002,8 +8002,8 @@ void ShowExampleAppDocuments(bool* p_open)
                     for (int n = 0; n < close_queue.Size; n++)
                         if (close_queue[n]->Dirty)
                             ImGui::Text("%s", close_queue[n]->Name);
-                    ImGui::EndChildFrame();
                 }
+                ImGui::EndChildFrame();
 
                 ImVec2 button_size(ImGui::GetFontSize() * 7.0f, 0.0f);
                 if (ImGui::Button("Yes", button_size))