Fix SQLite database version numbering

Author: Jamie Snape

core/database/sqlite/3.2.19.sql renamed to core/database/sqlite/3.2.20.sql

@@ -1,6 +1,6 @@
 -- MIDAS Server. Copyright Kitware SAS. Licensed under the Apache License 2.0.
 
--- SQLite core database, version 3.2.19
+-- SQLite core database, version 3.2.20
 
 CREATE TABLE IF NOT EXISTS "activedownload" (
     "activedownload_id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,