[orca] Fix traceback getting into Thunderbird preferences

[Joanmarie Diggs <joanied src gnome org>]

commit cabc0b0ad4b4256ca77a2ed632fd3d274012bd7d
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Mon Aug 17 17:39:11 2015 -0400

    Fix traceback getting into Thunderbird preferences

 src/orca/scripts/apps/Thunderbird/script.py |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/orca/scripts/apps/Thunderbird/script.py b/src/orca/scripts/apps/Thunderbird/script.py
index ae4ef8e..7eced35 100644
--- a/src/orca/scripts/apps/Thunderbird/script.py
+++ b/src/orca/scripts/apps/Thunderbird/script.py
@@ -92,7 +92,7 @@ class Script(Gecko.Script):
 
         grid = Gecko.Script.getAppPreferencesGUI(self)
 
-        self.sayAllOnLoadCheckButton.set_active(
+        self._sayAllOnLoadCheckButton.set_active(
             _settingsManager.getSetting('sayAllOnLoad'))
 
         spellcheck = self.spellcheck.getAppPreferencesGUI()
@@ -105,7 +105,7 @@ class Script(Gecko.Script):
         """Returns a dictionary with the app-specific preferences."""
 
         prefs = Gecko.Script.getPreferencesFromGUI(self)
-        prefs['sayAllOnLoad'] = self.sayAllOnLoadCheckButton.get_active()
+        prefs['sayAllOnLoad'] = self._sayAllOnLoadCheckButton.get_active()
         prefs.update(self.spellcheck.getPreferencesFromGUI())
 
         return prefs