lib: ensure path type in mkProfileAttrs

This is required so that filtering via lib.remove works against 
modules.core and similar which are of path type.

It is also a prerequisite for disabledModules to match by module.key
instead of path string relative to nixpkgs' modulePath.

lib/devos/mkProfileAttrs.nix

@@ -27,7 +27,7 @@ let mkProfileAttrs =
     f = n: _:
       lib.optionalAttrs
         (lib.pathExists "${dir}/${n}/default.nix")
-        { default = "${dir}/${n}"; }
+        { default = /. + "${dir}/${n}"; }
       // mkProfileAttrs "${dir}/${n}";
   in
   lib.mapAttrs f imports;