Mapping: fully revert AEPST to auEduPersonSharedToken

Fully revert AEPST mapping from shared-token to auEduPersonSharedToken.

Revert one more line changed in 7dea5230a542fef7dd235ae63488372f9aa0ab35
but not reverted in b0cc094d003b8b62242a128dafa92b2ee56703cc.