[simple-scan] Correct spelling of metadata_license

[Robert Ancell <rancell src gnome org>]

commit 5f046212cc0b9e1eda34c21718b95680c3fcc206
Author: Robert Ancell <robert ancell canonical com>
Date:   Wed Sep 20 16:05:06 2017 +1200

    Correct spelling of metadata_license

 data/simple-scan.appdata.xml.in |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/simple-scan.appdata.xml.in b/data/simple-scan.appdata.xml.in
index 2ad025d..898045a 100644
--- a/data/simple-scan.appdata.xml.in
+++ b/data/simple-scan.appdata.xml.in
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <component type="desktop">
   <id>simple-scan.desktop</id>
-  <metadata_licence>CC0-1.0</metadata_licence>
+  <metadata_license>CC0-1.0</metadata_license>
   <project_license>GPL-3.0+ and CC-BY-SA-3.0</project_license>
   <name>Simple Scan</name>
   <summary>Scan Documents</summary>