[gnote] Fix NotebookManager usage in special notes

[Aurimas Černius <aurimasc src gnome org>]

commit 9c4ab0b72fe7973a1e7c8549ea47a8b725630d7a
Author: Aurimas Černius <aurisc4 gmail com>
Date:   Mon Oct 21 16:38:13 2019 +0300

    Fix NotebookManager usage in special notes

 src/addins/specialnotes/specialnotesapplicationaddin.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/addins/specialnotes/specialnotesapplicationaddin.cpp 
b/src/addins/specialnotes/specialnotesapplicationaddin.cpp
index 2c92e2a0..d4e917aa 100644
--- a/src/addins/specialnotes/specialnotesapplicationaddin.cpp
+++ b/src/addins/specialnotes/specialnotesapplicationaddin.cpp
@@ -90,14 +90,14 @@ void SpecialNotesApplicationAddin::initialize()
     m_initialized = true;
 
     m_notebook = Notebook::Ptr(new SpecialNotesNotebook(note_manager()));
-    gnote::notebooks::NotebookManager::obj().add_notebook(m_notebook);
+    gnote::IGnote::obj().notebook_manager().add_notebook(m_notebook);
   }
 }
 
 void SpecialNotesApplicationAddin::shutdown()
 {
   if(m_notebook != NULL) {
-    gnote::notebooks::NotebookManager::obj().delete_notebook(m_notebook);
+    gnote::IGnote::obj().notebook_manager().delete_notebook(m_notebook);
     m_notebook.reset();
     m_initialized = false;
   }