Update EducationPage for change in IContextSource

IContextSource recently added the getConfig method. That interface is
implemented by EducationPage. This patch adds an implementation of
the new method.

Change-Id: I251b5549977f3f31dc965fb1a36c68eca62c8c13
(cherry picked from commit 9a1cbc61b8f01e3ef2bd1c08d517e3c5bd488985)