[latexila] Don't use g_settings_get_range() (deprecated)

[Sébastien Wilmet <swilmet src gnome org>]

commit af4066ac1457a858f34d7d48d53505cf6ee00c4b
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sat Dec 27 18:48:00 2014 +0100

    Don't use g_settings_get_range() (deprecated)

 src/preferences_dialog.vala |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/preferences_dialog.vala b/src/preferences_dialog.vala
index a8a4e16..5a69c10 100644
--- a/src/preferences_dialog.vala
+++ b/src/preferences_dialog.vala
@@ -352,7 +352,8 @@ public class PreferencesDialog : Dialog
     private void set_spin_button_range (SpinButton spin_button, GLib.Settings settings,
         string key)
     {
-        Variant range = settings.get_range (key);
+        GLib.SettingsSchema schema = settings.settings_schema;
+        Variant range = schema.get_key (key).get_range ();
 
         string range_type;
         Variant range_contents;