Fix offline roster contacts

Fix #1280
p_contact_set_presence() is triggered in
(roster_process_pending_presence) to set the presence to online
after the roster is displayed.

This happened to me _every time_ with one certain account on my server.
But not even once with other accounts on my server.

I don't understand why that is the case, but AFAIK the code should be
like it is in this PR anyways.

roster_process_pending_presence() was added there in
973a05d to fix
#1050

src/event/server_events.c

@@ -133,11 +133,12 @@ sv_ev_login_account_success(char *account_name, gboolean secured)
 void
 sv_ev_roster_received(void)
 {
+    roster_process_pending_presence();
+
     if (prefs_get_boolean(PREF_ROSTER)) {
         ui_show_roster();
     }
 
-    roster_process_pending_presence();
     char *account_name = session_get_account_name();
 
 #ifdef HAVE_LIBGPGME