Revert "Fixed linker errors of imgui backend on windows"

This reverts commit 378be743f8.

examples/main.cpp

@@ -7,11 +7,6 @@
 #include "Host/GraphicsAppManager.hpp"
 #include "ExampleApps/CubesExampleApp.hpp"
 
-// NOTE(vb): I couldn't find a way of linking with imgui_glfw using CMake
-#ifdef _WIN32
-# include "backends/imgui_impl_glfw.cpp"
-#endif
-
 using namespace OpenVulkano;
 
 int main(int argc, char** argv)