Fix "IO RD/RW" typo

Also micro-micro-micro optimization, probably: move READ/WRITE if statement before WRITE
as you'd probably find it more useful than just WRITE.

src/overlay.cpp

@@ -1379,10 +1379,10 @@ void render_imgui(swapchain_stats& data, struct overlay_params& params, ImVec2&
          ImGui::TableNextRow();
          if (params.enabled[OVERLAY_PARAM_ENABLED_io_read] && !params.enabled[OVERLAY_PARAM_ENABLED_io_write])
             ImGui::TextColored(ImGui::ColorConvertU32ToFloat4(params.io_color), "IO RD");
-         if (params.enabled[OVERLAY_PARAM_ENABLED_io_write] && !params.enabled[OVERLAY_PARAM_ENABLED_io_read])
+         else if (params.enabled[OVERLAY_PARAM_ENABLED_io_read] && params.enabled[OVERLAY_PARAM_ENABLED_io_write])
             ImGui::TextColored(ImGui::ColorConvertU32ToFloat4(params.io_color), "IO RW");
-         if (params.enabled[OVERLAY_PARAM_ENABLED_io_read] && params.enabled[OVERLAY_PARAM_ENABLED_io_write])
-            ImGui::TextColored(ImGui::ColorConvertU32ToFloat4(params.io_color), "IO RD/RW");
+         else if (params.enabled[OVERLAY_PARAM_ENABLED_io_write] && !params.enabled[OVERLAY_PARAM_ENABLED_io_read])
+            ImGui::TextColored(ImGui::ColorConvertU32ToFloat4(params.io_color), "IO WR");
 
          if (params.enabled[OVERLAY_PARAM_ENABLED_io_read]){
             ImGui::TableNextCell();