Add espeakup to the list of offline packages

At the moment it's missing, leading to:

    finish-install: info: Running /usr/lib/finish-install.d/06espeakup
    [...]
    in-target: E: Unable to locate package espeakup

simple-cdd/profiles/offline.downloads

@@ -8,6 +8,9 @@ virtualbox-guest-utils
 virtualbox-guest-x11
 xauth
 xserver-xorg-video-vmware
+# Add packages required for speech synthesis (installed by
+# /usr/lib/finish-install.d/06espeakup) including their recommends
+espeakup
 # Ensure unrar is available, otherwise the "unrar | unar" dependency
 # in kali-linux-headless ends up satisfied by the unar alternative
 unrar