inlyne: fix installing shell completions

upstream recommends using cargo xtask gen, but checks in the results

pkgs/applications/misc/inlyne/default.nix

@@ -53,9 +53,9 @@ rustPlatform.buildRustPackage rec {
 
   postInstall = ''
     installShellCompletion --cmd inlyne \
-      --bash <($out/bin/inlyne --gen-completions bash) \
-      --fish <($out/bin/inlyne --gen-completions fish) \
-      --zsh <($out/bin/inlyne --gen-completions zsh)
+      --bash completions/inlyne.bash \
+      --fish completions/inlyne.fish \
+      --zsh completions/_inlyne
   '';
 
   postFixup = lib.optionalString stdenv.isLinux ''