[gegl] tests: Update test-serialize for new gegl:exposure property

[Debarshi Ray <debarshir src gnome org>]

commit bbf8c1e60340c8e16110a14e1962e8de4b56af43
Author: Debarshi Ray <debarshir gnome org>
Date:   Thu Feb 9 13:12:15 2017 +0100

    tests: Update test-serialize for new gegl:exposure property

 tests/simple/test-serialize.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/tests/simple/test-serialize.c b/tests/simple/test-serialize.c
index 96fcfa6..285bd02 100644
--- a/tests/simple/test-serialize.c
+++ b/tests/simple/test-serialize.c
@@ -73,7 +73,7 @@ TestCase tests[] = {
 
     {"exposure foo=2",
      "gegl:exposure",
-     "gegl:exposure has no foo property, properties: 'exposure', 'offset', 'gamma', "},
+     "gegl:exposure has no foo property, properties: 'black', 'exposure', 'offset', 'gamma', "},
 
     {"over aux=[text string='foo bar']",
      "svg:src-over aux=[ gegl:text string='foo bar' width=33 height=7 ]",