Fix EducationPage::getConfig()

EducationPage implements IContextSource including its recently added
getConfig() method. This patch fixes a mistake in the implementation
of that method.

Change-Id: I07b6f6980ce3f2a0f7012b971c470868585dcb4a
(cherry picked from commit 72a56467dc3ec6d3e22dd5f3e003dc9f31e26304)