Fix an issue preventing Cutter from starting because it can't find Qt plugins.

Motivation for this change

When using the current version of radare2-cutter, I encountered the following error message when starting Cutter:
qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in "".

The problem was fixed as proposed in #54525 by wrapping Cutter with the Qt application wrapper.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• 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 nix-review --run "nix-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.

Notify maintainers

cc @Mic92 @dtzWill