revised invite method to avoid double step in case of registration

git-svn-id: https://svn.research-infrastructures.eu/d4science/gcube/trunk/portal/invites-common-library@158945 82a268e6-3cf1-43bd-a215-b396298e98cf

src/main/java/org/gcube/portal/invites/InvitesManager.java

@@ -128,7 +128,7 @@ public class InvitesManager {
 					.append(new String(Base64.encodeBase64((""+groupId).getBytes())));
 
 			StringBuilder linkToAcceptInvite = new StringBuilder(gatewayURL)
-					.append(PortalContext.getConfiguration().getSiteLandingPagePath(request))
+					.append("/")
 					.append(INVITE_PAGE_ENDPOINT)
 					.append("?")
 					.append(getParamsEncoded);