Make saving/loading bar less prominent

[Usul]

The saving/loading bar is now much thicker and therefore far more visually prominent than the thin bar it used to be. The interrupt of the game flow caused by autosaving is one of the few things in factorio that interferes with immersion in my opinion, which is the only reason I increase the autosave interval to as long as possible.

Please reinstate thin bar again. This would be consistent with the thickness of the iconic game startup loading screen bar.

Or, if you had good reasons to make it more prominent, I suggest reducing it's thickness to be consistent with the thickness of the progress bar in machine GUIs (e.g. Assember).

Thank you!