tools/xenstore: Fix indentation in the header of xenstored_control.c

Commit e867af081d "tools/xenstore: save new binary for live update"
seemed to have spuriously changed the indentation of the first line of
the copyright header.

The previous indentation is re-instated so all the lines are indented
the same.

Reported-by: Bjoern Doebel <doebel@amazon.com>
Signed-off-by: Julien Grall <jgrall@amazon.com>
Reviewed-by: Juergen Gross <jgross@suse.com>

tools/xenstore/xenstored_control.c

@@ -1,5 +1,5 @@
 /*
-Interactive commands for Xen Store Daemon.
+    Interactive commands for Xen Store Daemon.
     Copyright (C) 2017 Juergen Gross, SUSE Linux GmbH
 
     This program is free software; you can redistribute it and/or modify