Switch from www.ptb.de which is sending a randomised time to google.com.

Signed-off-by: david <db@d1b.org>
diff --git a/etc/tlsdated.conf b/etc/tlsdated.conf
index 6b3b9be..ca42029 100644
--- a/etc/tlsdated.conf
+++ b/etc/tlsdated.conf
@@ -18,7 +18,7 @@
 
 # Host configuration.
 source
-	host www.ptb.de
+	host google.com
 	port 443
 	proxy none
 end