Remove newline at EOF in hudson.model.UpdateCenter.xml

Jenkins saves this file without thiw newline, so while we have it,
formula always restarts jenkins even if there is no changes in this XML.

Change-Id: I0a1ebeae47d6bc81fff1cc54170e0bdfa65add9f
diff --git a/jenkins/files/hudson.model.UpdateCenter.xml b/jenkins/files/hudson.model.UpdateCenter.xml
index 571853e..7c9de8b 100644
--- a/jenkins/files/hudson.model.UpdateCenter.xml
+++ b/jenkins/files/hudson.model.UpdateCenter.xml
@@ -5,4 +5,4 @@
     <id>default</id>
     <url>{{ master.update_site_url }}</url>
   </site>
-</sites>
+</sites>
\ No newline at end of file