[gbrainy] Remove unused variables

[Jordi Mas <jmas src gnome org>]

commit e137bd5117e9df573d36993b339ac788f546f042
Author: Jordi Mas <jmas softcatala org>
Date:   Thu Aug 25 16:01:47 2022 +0200

    Remove unused variables

 src/Clients/Classical/Dialogs/PreferencesDialog.cs | 1 -
 src/Clients/Classical/gbrainy.cs                   | 2 --
 2 files changed, 3 deletions(-)
---
diff --git a/src/Clients/Classical/Dialogs/PreferencesDialog.cs 
b/src/Clients/Classical/Dialogs/PreferencesDialog.cs
index 95b64813..11a44ec1 100644
--- a/src/Clients/Classical/Dialogs/PreferencesDialog.cs
+++ b/src/Clients/Classical/Dialogs/PreferencesDialog.cs
@@ -36,7 +36,6 @@ namespace gbrainy.Clients.Classical.Dialogs
                [Builder.Object] Gtk.RadioButton rb_master;
                [Builder.Object] Gtk.ComboBox themes_combobox;
                [Builder.Object] Gtk.CheckButton englishcheckbutton;
-               [Builder.Object] Gtk.CheckButton loadextensionscheckbutton;
                [Builder.Object] Gtk.CheckButton usesoundscheckbutton;
 
                const int COLUMN_VALUE = 1;
diff --git a/src/Clients/Classical/gbrainy.cs b/src/Clients/Classical/gbrainy.cs
index cafa28ab..bf865d58 100644
--- a/src/Clients/Classical/gbrainy.cs
+++ b/src/Clients/Classical/gbrainy.cs
@@ -45,7 +45,6 @@ namespace gbrainy.Clients.Classical
                [Builder.Object] Gtk.Button tip_button;
                [Builder.Object] Gtk.Button next_button;
                [Builder.Object] Gtk.Statusbar statusbar;
-               [Builder.Object] Gtk.MenuBar menubar;
                [Builder.Object] Gtk.MenuItem pause_menuitem;
                [Builder.Object] Gtk.MenuItem finish_menuitem;
                [Builder.Object] Gtk.MenuItem newgame_menuitem;
@@ -65,7 +64,6 @@ namespace gbrainy.Clients.Classical
                GameSession session;
                bool full_screen;
                GameSession.Types initial_session;
-               static bool pluggins_loaded;
 
                public readonly int MIN_TRANSLATION = 80;