Updated mediawiki/extensions
Project: mediawiki/extensions/BookManagerv2  4f920c6dd3e353c7083b05993573bb94ae275835

Bug 50762: Add variables to show/hide items in the navbar.

This allows people to hide the metadata, table of contents,
prev/next links, or some combination of these.

Change-Id: I72e087be683493d8bdcf3afd5bb802e1566572e0