Gopro hero 8 hard shell

This is a remix of the one of the no mount versions of the GoPro Hero 8 Sleeve & Mount by cleaner.

The original was designed to be printed in a flexible material, but won't fit the go pro hero 8 if printed in a hard material like PLA.

I've modified the original to make it suitable for printing in PLA.

- Added a hole for the top button,
- Added an internal groove, so that the top button doesn't prevent insertion.
- removed the plastic tab that would block insertion.
- scaled up slightly, for a better fit (although still quite tight)