Make "otherProjectsLinks" setting compatible with the "special" sitelink group

Deploy: Requires the "specialSiteLinkGroups" setting to be set on
client.
Change-Id: I07abcbafbd18a66089685f8fba7164744f9011c9
(cherry picked from commit 6acd5c4866b06fa5da0603d95ed94367e8b7f757)