[gimp] app: fix indentation in gimpmaskundo.h

[Ell <ell src gnome org>]

commit 4db566f0e1ae2c5921057cf5f5dd44bf6ac77c10
Author: Ell <ell_se yahoo com>
Date:   Sun Jan 20 10:33:00 2019 -0500

    app: fix indentation in gimpmaskundo.h

 app/core/gimpmaskundo.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/app/core/gimpmaskundo.h b/app/core/gimpmaskundo.h
index 4f0a681180..53b92e8000 100644
--- a/app/core/gimpmaskundo.h
+++ b/app/core/gimpmaskundo.h
@@ -35,9 +35,9 @@ typedef struct _GimpMaskUndoClass GimpMaskUndoClass;
 
 struct _GimpMaskUndo
 {
-  GimpItemUndo  parent_instance;
+  GimpItemUndo   parent_instance;
 
-  gboolean      convert_format;
+  gboolean       convert_format;
 
   const Babl    *format;
   GeglBuffer    *buffer;