[gnome-builder] tests: use GSETTINGS_BACKEND environment variable

[Christian Hergert <chergert src gnome org>]

commit e9d1e2bc70a04d028ab699e199fe3ab0f4e0e181
Author: Christian Hergert <christian hergert me>
Date:   Thu Jan 14 08:00:47 2016 -0800

    tests: use GSETTINGS_BACKEND environment variable

 tests/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 4db88ec..60aea01 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -64,7 +64,7 @@ TESTS_ENVIRONMENT= \
        G_TEST_SRCDIR="$(abs_srcdir)"                               \
        G_TEST_BUILDDIR="$(abs_builddir)"                           \
        G_DEBUG=gc-friendly                                         \
-       G_SETTINGS_BACKEND=memory                                   \
+       GSETTINGS_BACKEND=memory                                   \
        GB_IN_TREE_PLUGINS=1                                        \
        MALLOC_CHECK_=2                                             \
        MALLOC_PERTURB_=$$(($${RANDOM:-256} % 256))