made sops-install-secrets working when cross-system is set

Author: dguibert

modules/home-manager/sops.nix

@@ -2,7 +2,7 @@
 
 let
   cfg = config.sops;
-  sops-install-secrets = (pkgs.callPackage ../.. {}).sops-install-secrets;
+  sops-install-secrets = (pkgs.buildPackages.callPackage ../.. {}).sops-install-secrets;
   secretType = lib.types.submodule ({ config, name, ... }: {
     options = {
       name = lib.mkOption {