Examples: Win32+OpenGL3: enable DPI awareness. (#9083)

examples/example_win32_opengl3/main.cpp

@@ -37,7 +37,7 @@ LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
 int main(int, char**)
 {
     // Make process DPI aware and obtain main monitor scale
-    //ImGui_ImplWin32_EnableDpiAwareness(); // FIXME: This somehow doesn't work in the Win32+OpenGL example. Why?
+    ImGui_ImplWin32_EnableDpiAwareness();
     float main_scale = ImGui_ImplWin32_GetDpiScaleForMonitor(::MonitorFromPoint(POINT{ 0, 0 }, MONITOR_DEFAULTTOPRIMARY));
 
     // Create application window