spec: don't require recordmydesktop - rhbz#959475

- it pulls the jack sound server which consumes many kb on livecd
- on the regular installs it will be pulled thru comps and it won't
  be needed when gnome3 provides an API for their built-in screencasting
  https://bugzilla.gnome.org/show_bug.cgi?id=696247

Signed-off-by: Jiri Moskovcak <jmoskovc@redhat.com>