[gnome-continuous] Update build options for gnome-desktop's switch to meson

[Jeremy Bicha <jbicha src gnome org>]

commit 19452bab390a56a6e1d1163ddb0cfeeb949ddb90
Author: Jeremy Bicha <jbicha ubuntu com>
Date:   Fri Sep 7 13:08:36 2018 -0400

    Update build options for gnome-desktop's switch to meson

 manifest.json | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/manifest.json b/manifest.json
index 7f46def..b35ee3d 100644
--- a/manifest.json
+++ b/manifest.json
@@ -779,8 +779,8 @@
                {"src": "gnome:gnome-desktop.git",
                  "name": "gnome-desktop",
                 "config-opts": [
-                               "--disable-desktop-docs",
-                               "--enable-installed-tests"]},
+                               "-Ddesktop_docs=false",
+                               "-Dinstalled_tests=true"]},
 
                {"src": "linuxwacom:xf86-input-wacom.git",
                 "patches": ["libwacom-autogen.patch"]},