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/userfunctions.py b/Lib/sqlite3/test/userfunctions.py
index 8bfc591..0541e25 100644
--- a/Lib/sqlite3/test/userfunctions.py
+++ b/Lib/sqlite3/test/userfunctions.py
@@ -1,4 +1,4 @@
-#-*- coding: ISO-8859-1 -*-
+#-*- coding: iso-8859-1 -*-
 # pysqlite2/test/userfunctions.py: tests for user-defined functions and
 #                                  aggregates.
 #