Fix parsing of focus out actions

The key is uppercase B with lowercase L. Not I.
diff --git a/poppler/Annot.cc b/poppler/Annot.cc
index c6c2c74..9549856 100644
--- a/poppler/Annot.cc
+++ b/poppler/Annot.cc
@@ -37,6 +37,7 @@
 // Copyright (C) 2015 Tamas Szekeres <szekerest@gmail.com>
 // Copyright (C) 2017 Hans-Ulrich Jüttner <huj@froreich-bioscientia.de>
 // Copyright (C) 2018 Klarälvdalens Datakonsult AB, a KDAB Group company, <info@kdab.com>. Work sponsored by the LiMux project of the city of Munich
+// Copyright 2018 Andre Heinecke <aheinecke@intevation.de>
 //
 // To see a description of the changes please see the Changelog file that
 // came with your tarball or type make ChangeLog if you are building from git
@@ -221,7 +222,7 @@
                        type == Annot::actionMousePressed ?   "D" :
                        type == Annot::actionMouseReleased ?  "U" :
                        type == Annot::actionFocusIn ?       "Fo" :
-                       type == Annot::actionFocusOut ?      "BI" :
+                       type == Annot::actionFocusOut ?      "Bl" :
                        type == Annot::actionPageOpening ?   "PO" :
                        type == Annot::actionPageClosing ?   "PC" :
                        type == Annot::actionPageVisible ?   "PV" :