osu-mime: fix icon collisions with Nixpkgs' osu-lazer-bin #524

Job	Run time
check (NIXPKGS_ALLOW_INSECURE=1 nix flake check --accept-flake-config --impure) / nix	1m 56s
check (nix run nixpkgs#alejandra -- -c . -e ./npins) / nix	1m 7s
build / build (faf-client) / nix	1m 56s
build / build (proton-ge) / nix	1m 22s
build / build (faf-client-unstable) / nix	1m 58s
build / build (wine-ge) / nix	2m 7s
build / build (wine-osu) / nix	2m 2s
build / build (wine-tkg) / nix	2m 3s
	14m 31s

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