[gnome-klotski] help: fix typos from meson conversion

[Jeremy Bicha <jbicha src gnome org>]

commit 9518507a5dadc92e6d1373aeb8ee05611a6cbbe4
Author: Jeremy Bicha <jbicha ubuntu com>
Date:   Sun Mar 10 15:19:11 2019 -0400

    help: fix typos from meson conversion
    
    Closes: https://bugs.debian.org/924093

 help/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/help/meson.build b/help/meson.build
index 5a4ebbb..a7ad7c2 100644
--- a/help/meson.build
+++ b/help/meson.build
@@ -1,6 +1,6 @@
 gnome.yelp (meson.project_name(),
             sources: [ 'index.docbook',
                        'legal.xml'],
-            media: [ 'figures/gnotski_start-window.png',
+            media: [ 'figures/gnotski_start_window.png',
                      'figures/gnotski_win.png'],
             symlink_media: true)