new-call-box: Decide if numeric input is needed based on the origins protocol

The numeric addresses property conveys no additional information.
By changing the logic here we can get rid of the "numeric-addresses" property
alltogether.

src/calls-new-call-box.c

@@ -147,7 +147,7 @@ notify_selected_index_cb (CallsNewCallBox *self)
   gboolean numeric_input = TRUE;
 
   if (origin)
-    g_object_get (origin, "numeric-addresses", &numeric_input, NULL);
+    numeric_input = calls_origin_supports_protocol (origin, "tel");
 
   set_numeric (self, numeric_input);
 }