Insta360 One GoPro Mount

This is a fix for a model made originally for TPU, adapted to work with PLA.

- Moved the hole 2mm higher and made it bigger so you can actually reach the button.
- Added an extra 1mm to the overall body to make it fit nicely.
- Rounded the bottom 'cause it wouldn't fit on some gopro holders without an inclination.

There is still some room for it to spin inside the case (overall design flaw), you should stick some thin piece of foam-like inside so it has some grip.