dtv multisat: Allow command line option dvb-satno.

With this option marked as unsafe, it is not possible to use it and
as a result, it is not possible to tune to different satellite on
different DiSEqC LNB.
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>
(cherry picked from commit 06683a063d0aa4096ff92edaa036d70853ec4b98)

modules/access/dtv/access.c

@@ -383,6 +383,7 @@ vlc_module_begin ()
 #ifdef HAVE_LINUX_DVB
     add_integer ("dvb-satno", 0, SATNO_TEXT, SATNO_LONGTEXT, true)
         change_integer_list (satno_vlc, satno_user)
+        change_safe ()
     add_integer ("dvb-tone", -1, TONE_TEXT, TONE_LONGTEXT, true)
         change_integer_list (auto_off_on_vlc, auto_off_on_user)
 #endif