text: Title: Add action for background box for scale bar overlay
  Body: ## 🚀 Feature
  
  #4511 added some really cool functionality to the scale bar, including a translucent box for improved visibility when overlaid on certain images. I totally missed it at the time and I was today years old when I discovered that functionality. 😂 A strong reason for this is that there's no corresponding toggle in the View>Scale Bar menu. We should add one! Hopefully it is not too hard to do by modeling it after the existing toggles (visible, colored, and ticks).