[gnote] Remove redundant declaration

[Aurimas Černius <aurimasc src gnome org>]

commit a44dfaf54ac9783fff93582d62cf5e9acdb600a9
Author: Aurimas Černius <aurisc4 gmail com>
Date:   Sun Oct 6 21:31:32 2019 +0300

    Remove redundant declaration

 src/noteaddin.hpp | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/src/noteaddin.hpp b/src/noteaddin.hpp
index 93f27d01..727a3886 100644
--- a/src/noteaddin.hpp
+++ b/src/noteaddin.hpp
@@ -39,8 +39,6 @@
 
 namespace gnote {
 
-  class NoteManager;
-
 /// <summary>
 /// A NoteAddin extends the functionality of a note and a NoteWindow.
 /// If you wish to extend Tomboy in a more broad sense, perhaps you