[orca] Fix c&p error

[Joanmarie Diggs <joanied src gnome org>]

commit 7dd8f36273355cd8acb01b703bee13633e83e839
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Thu Sep 26 14:27:31 2019 +0200

    Fix c&p error

 src/orca/script_utilities.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/orca/script_utilities.py b/src/orca/script_utilities.py
index 3eccc3b17..e84faa362 100644
--- a/src/orca/script_utilities.py
+++ b/src/orca/script_utilities.py
@@ -2730,7 +2730,7 @@ class Utilities:
         toBuild = list(string)
         for i, char in enumerate(toBuild):
             if char == self.EMBEDDED_OBJECT_CHARACTER:
-                child = getChildAtOffset(obj, i + startOffset)
+                child = self.getChildAtOffset(obj, i + startOffset)
                 toBuild[i] = expandEOCs(child)
 
         return "".join(toBuild)