cosmic-bg: `bin-src` -> `cargo-target-dir`

Avoids hardcoding the path to the binary, making
the packaging more robust.

+2 -2
+2 -2
pkgs/by-name/co/cosmic-bg/package.nix
··· 45 45 "prefix" 46 46 (placeholder "out") 47 47 "--set" 48 - "bin-src" 49 - "target/${stdenv.hostPlatform.rust.cargoShortTarget}/release/cosmic-bg" 48 + "cargo-target-dir" 49 + "target/${stdenv.hostPlatform.rust.cargoShortTarget}" 50 50 ]; 51 51 52 52 passthru = {