Remove trailing spaces

imgui.cpp

@@ -4159,7 +4159,7 @@ void ImGui::Render()
     g.FrameCountRendered = g.FrameCount;
     g.IO.MetricsRenderWindows = 0;
     g.DrawDataBuilder.Clear();
-    
+
     // Add background ImDrawList
     if (!g.BackgroundDrawList.VtxBuffer.empty())
         AddDrawListToDrawData(&g.DrawDataBuilder.Layers[0], &g.BackgroundDrawList);