Make sqlite3 tests editable with Emacs

Change the coding declaration from ISO-8859-1 to iso-8859-1. Emacs
doesn't understand the former.
diff --git a/Lib/sqlite3/test/regression.py b/Lib/sqlite3/test/regression.py
index c7551e3..9d7b276 100644
--- a/Lib/sqlite3/test/regression.py
+++ b/Lib/sqlite3/test/regression.py
@@ -1,4 +1,4 @@
-#-*- coding: ISO-8859-1 -*-
+#-*- coding: iso-8859-1 -*-
 # pysqlite2/test/regression.py: pysqlite regression tests
 #
 # Copyright (C) 2006-2010 Gerhard Häring <gh@ghaering.de>