Use SQL that SQLite 3.7.8 understands

When attempting to install the current extension code to a Wiki using a
SQLite database version 3.7.8, installation will fail while running
update.php because this SQLite version is unable to insert multiple
rows - using the VALUES keyword - at once.

Bug: 54013
Change-Id: I90b0cc01fc747cb20f9bf9c79eebb2ada5b8fa5e