[gnome-nibbles] update screenshot for new appdata-validate

[Michael Catanzaro <mcatanzaro src gnome org>]

commit a8769a73e76ac4a59d25902c9a84eba67a944546
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sat Oct 19 22:11:43 2013 -0500

    update screenshot for new appdata-validate

 data/gnome-nibbles.appdata.xml.in |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/gnome-nibbles.appdata.xml.in b/data/gnome-nibbles.appdata.xml.in
index 2311573..fc8e951 100644
--- a/data/gnome-nibbles.appdata.xml.in
+++ b/data/gnome-nibbles.appdata.xml.in
@@ -23,7 +23,7 @@
   </_p>
  </description>
  <screenshots>
-  <_screenshot type="default" width="652" 
height="560">https://people.gnome.org/~mcatanzaro/gnome-nibbles.png</_screenshot>
+  <screenshot type="default" width="1200" 
height="675">https://people.gnome.org/~mcatanzaro/gnome-nibbles.png</screenshot>
  </screenshots>
  <url type="homepage">https://wiki.gnome.org/Nibbles</url>
  <updatecontact>games_list_at_gnome.org</updatecontact>