[gnote] Use get_content_area instead of get_vbox

[Aurimas Černius <aurimasc src gnome org>]

commit 02a310b0d11378ce0f98afeb677c0a2dff290bb1
Author: Aurimas Černius <aurisc4 gmail com>
Date:   Sun May 23 21:34:31 2021 +0300

    Use get_content_area instead of get_vbox

 src/synchronization/syncdialog.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/synchronization/syncdialog.cpp b/src/synchronization/syncdialog.cpp
index 479a22f2..ea7a943f 100644
--- a/src/synchronization/syncdialog.cpp
+++ b/src/synchronization/syncdialog.cpp
@@ -128,7 +128,7 @@ public:
       get_content_area()->pack_start(*deleteExistingRadio);
 
       alwaysDoThisCheck = manage(new Gtk::CheckButton(_("Always perform this action")));
-      get_vbox()->pack_start(*alwaysDoThisCheck);
+      get_content_area()->pack_start(*alwaysDoThisCheck);
 
       continueButton = add_button(_("_Continue"), Gtk::RESPONSE_ACCEPT);