[pan2] Fix typo in header guard

[Petr Kovář <pmkovar src gnome org>]

commit 35ecd627592786782e635b5f63b0f8046518948d
Author: Olaf Seibert <rhialto falu nl>
Date:   Mon Mar 14 20:15:47 2016 +0100

    Fix typo in header guard
    
    found by clang:
    warning: '__SaveAttachUI_h__' is used as a header guard here, followed by #define of a different macro

 pan/gui/save-attach-ui.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/pan/gui/save-attach-ui.h b/pan/gui/save-attach-ui.h
index a1beb24..8d03f20 100644
--- a/pan/gui/save-attach-ui.h
+++ b/pan/gui/save-attach-ui.h
@@ -18,7 +18,7 @@
  */
 
 #ifndef __SaveAttachUI_h__
-#define __SaveattachUI_h__
+#define __SaveAttachUI_h__
 
 #include <string>
 #include <vector>