removed version checking for a feature since the app now uses sdl3

SakuraVNE/src/Application.cpp

@@ -6,10 +6,6 @@
 #include "imgui_impl_sdl3.h"
 #include "imgui_impl_sdlrenderer3.h"
 
-#if !SDL_VERSION_ATLEAST(2, 0, 17)
-#error This backend requires SDL 2.0.17+ because of SDL_RenderGeometry() function
-#endif
-
 WindowData Application::m_WindowData;
 bool Application::m_isRunning = false;