[gtk+] Fix a copy-paste error

[Matthias Clasen <matthiasc src gnome org>]

commit 6aa1d69978ddcf36038a03c3ec1a06169432791f
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Jul 1 13:17:51 2013 -0400

    Fix a copy-paste error

 tests/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 628a73f..d48bbd8 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -480,7 +480,7 @@ teststack_SOURCES = teststack.c
 
 testrevealer_SOURCES = testrevealer.c
 
-testtitlebar_SOURCES = testrevealer.c
+testtitlebar_SOURCES = testtitlebar.c
 
 testwindowsize_SOURCES = testwindowsize.c