refactor(url-lib): write curl output directly to file

[lnykryn]

The redirection to stdout was originally added to workaround https://bugzilla.redhat.com/show_bug.cgi?id=989133 (curl would create no file if the source was empty), but I don't see that problem with current curl.

A nice side-effect of this change is that curl shows download progress.

(cherry picked from commit 1343d21d8c0d1f7239e27165e9c7633b504f777f)

Resolves: #2112475

(cherry picked from commit ... )

Resolves: #

[pvalena]

LGTM.

[pvalena]

FYI @jamacku:

Error: It wasn't possible to enable this project.
Repository 'epel-9-x86_64' does not exist in project 'packit/redhat-plumbers-dracut-rhel9-51'.
Available repositories: 'centos-stream-9-x86_64', 'centos-stream-9-aarch64'

If you want to enable a non-default repository, use the following command:
  'dnf copr enable packit/redhat-plumbers-dracut-rhel9-51 <repository>'
But note that the installed repo file will likely need a manual modification.