[orca] Fix a traceback

[Joanmarie Diggs <joanied src gnome org>]

commit c232b72a791c17064b479a6fe2bfe131990a11bc
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Mon Aug 29 22:51:26 2016 -0400

    Fix a traceback

 src/orca/structural_navigation.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/orca/structural_navigation.py b/src/orca/structural_navigation.py
index c219e33..543391c 100644
--- a/src/orca/structural_navigation.py
+++ b/src/orca/structural_navigation.py
@@ -1148,7 +1148,7 @@ class StructuralNavigation:
         if self._presentWithSayAll(obj, offset):
             return
 
-        self._script.presentObject(obj, offset)
+        self._script.presentObject(obj, offset=offset)
 
     def _presentWithSayAll(self, obj, offset):
         if self._script.inSayAll() \