fh add Adding a url to inputs that ist not a flake should add flake = false;

[BenediktBroich]

Adding a input url fh add github:emacs-straight/org-mode that is not a flake only adds org-mode.url = "github:emacs-straight/org-mode";.
The tool should detect that the input is not a flake or there should be an option to also add org-mode.flake = false; for this input.