[cli] Allow sharing files and URLs together

Summary:
Depends on D15787

Restricting sharing multiple urls to files seems unnecessary to me.

Test Plan: kdeconnect-cli --share foo.txt google.com

Reviewers: KDE Connect, apol

Reviewed By: KDE Connect, apol

Subscribers: apol, kdeconnect

Tags: KDE Connect

Differential Revision: https://phabricator.kde.org/D15788