Add missing includes for gcc

Bug:https://github.com/ArthurSonzogni/FTXUI/issues/695

src/ftxui/component/window.cpp

@@ -91,7 +91,6 @@ Element DefaultRenderState(const WindowRenderState& state) {
   element = window(text(state.title), element);
   element |= clear_under;
 
-
   Color color = Color::Red;
 
   element = std::make_shared<ResizeDecorator>(  //
@@ -304,3 +303,7 @@ Component Window(WindowOptions option) {
 }
 
 };  // namespace ftxui
+
+// Copyright 2023 Arthur Sonzogni. All rights reserved.
+// Use of this source code is governed by the MIT license that can be found in
+// the LICENSE file.