Motivation for this change

Currently in master, Carla fails to launch with the error:

Traceback (most recent call last):
  File "/nix/store/s2k98gvi5p4srqsrspjyszdk9nh2w8r9-carla-2.2.0/share/carla/carla", line 23, in <module>
    from carla_host import *
  File "/nix/store/s2k98gvi5p4srqsrspjyszdk9nh2w8r9-carla-2.2.0/share/carla/carla_host.py", line 40, in <module>
    from PyQt5.QtCore import (
ModuleNotFoundError: No module named 'PyQt5.sip'

This failure was traced back to commit 6347fdf from #108041, thanks to git bisect (thank you for your existence).

After that, it was kind of a shot in the dark, I remembered that Python dependencies needed to be specified under "propagatedBuildInputs" and not "buildInputs". I am not sure why the python wrapping was missing PyQt5_sip and other things, but it should be fixed, now.

Also fixed carla-database since I noticed it wasn't properly wrapped.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.