`OvGame` runtime crash since renderer refactor

[adriengivry]

Description
OvGame crashes in CompositeRenderer::DrawFrame due to missing output buffer (the game doesn't use framebuffers).

To Reproduce
Steps to reproduce the behavior:

1. Build the game (temp build)
2. See error

Expected behavior
The game shouldn't crash. The game should also make use of framebuffers now.

Callstack

OvGame.exe!OvRendering::Core::CompositeRenderer::DrawFrame() Line 43	C++
OvGame.exe!RenderCurrentScene(OvCore::Rendering::SceneRenderer & p_renderer, const OvGame::Core::Context & p_context) Line 80	C++
OvGame.exe!OvGame::Core::Game::Update(float p_deltaTime) Line 114	C++
OvGame.exe!OvGame::Core::Application::Run() Line 28	C++
OvGame.exe!main() Line 22	C++