[Go] Fix XML error in indentation rules. (#2792)

Go/Indention Rules.tmPreferences

@@ -1,12 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <!--
 
 Note: with the current API, it seems impossible to make rules that would
 batch-reindent real-world code without wrecking it. As such, these rules are
 optimized for convenience while typing, not for batch reindentation.
 
 -->
-
-<?xml version="1.0" encoding="UTF-8"?>
 <plist version="1.0">
 <dict>
 	<key>scope</key>