Jumper T-Lite gimbal cover (improved version)

This is improved version of https://www.thingiverse.com/thing:4758591
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It includes this fixes and improvements compared to original one:


- bigger gimbal stick holes for new revision of radio controller
- middle section is now reinforced, should not break easily
- middle section is placed a little higher than before, it should not press any buttons
- even if your print is loose (either you have old gimbal sticks, or your printer accuracy was off), you can still attach it securely using velcro strap or something similar using the hole in the middle section, instead of throwing it away
- I've removed integrated middle support, as your slicer will do better job generating it anyway

And yes, I'm aware that text is mirrored, its just hard to fix having only mesh file ;)