XT60 Safety Cap - combined Full And Empty

I liked the icons on this XT60 safety caps (https://www.thingiverse.com/thing:1839821) but I would eventually lose the Full or Empty cap.
So I combined them into one cap. Battery is full if plugged into Full-side and empty if plugged into Empty-side.

Changes to original design:
- Combined the Full and Empty caps.
- Added small 0.1mm ribs inside the XT60 plug to make it little tighter. My prints were not holding on XT60 connectors without this modification.