(bug 56760) Update logo for Korean Wikibooks

This patch changes the logo for Korean Wikibooks
from the default English logo into a localized
version approved through an on-wiki discussion
by the community; see bug for URL with consensus.

The file has been protected on Commons against
re-uploads and moves for all users except admins.

Bug: 56760
Change-Id: I4e3113c28141a18e87150b3b3d754e82f5b774db