Add forgotten multiply by two to titlebar button right alignment position calculation.

backends/ui/imgui/RendererBackend.cpp

@@ -508,7 +508,7 @@ void RendererBackend::EndMainMenuBar() {
     float padding = ImGui::GetStyle().FramePadding.x;
     float spacing = ImGui::GetStyle().ItemSpacing.x;
     for (size_t i = 0; i < titlebar_btn_count; i++) {
-        tmp -= padding;
+        tmp -= padding * 2.0f;
         // No need to use the correct index, as long as this is hit only once.
         if (i == 0) tmp -= spacing / 2.0f;
         else tmp -= spacing;