update toy manifest for nimish

Remove Mike's backfill change for ep-engine from the toy build.

Change-Id: Ic00b814707c71615c8db7a10ce1d7c007f0222ce
Reviewed-on: http://review.couchbase.org/41955
Reviewed-by: Nimish Gupta <nimish@couchbase.com>
Tested-by: Nimish Gupta <nimish@couchbase.com>