[orca] Fix typo

[Joanmarie Diggs <joanied src gnome org>]

commit 8122da528e3fe6f57ace01d762c85fa97463b9c5
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Fri Oct 18 12:58:21 2019 -0400

    Fix typo

 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 9f242e705..a3f406cb5 100644
--- a/src/orca/script_utilities.py
+++ b/src/orca/script_utilities.py
@@ -3328,7 +3328,7 @@ class Utilities:
 
             string = event.source.queryText().getText(0, -1)
             if string.endswith(event.any_data):
-                selection, start, end = self.selectedText(obj)
+                selection, start, end = self.selectedText(event.source)
                 if selection == event.any_data:
                     return True