things-manager: remove reference to groupsyncaction
things-manager: remove reference to groupsyncaction

This SConscript tried to include service/things-manager/sampleapp/linux
/groupsyncaction/SConscript which does not exists, remove the reference.

Change-Id: Ic5265db3757539113121d1e68df542ca744b54e8
Signed-off-by: Hauke Mehrtens <435ddd46dc66c007a1fa20144c823d37e0d23436@hauke-m.de>
Reviewed-on: https://gerrit.iotivity.org/gerrit/4819
Tested-by: jenkins-iotivity <09cb29e8a2b473a2c978382eec13ee06fa017bda@opendaylight.org>
Reviewed-by: Jihun Ha <3b6954bd112a2585eced0b86af3c85401a826886@samsung.com>
Reviewed-by: Madan Lanka <f0ab8ffa6f9be130982d9ec09d220706b52daee1@samsung.com>
Reviewed-by: Uze Choi <3a26c91d8a4a3c9e246e43339f4782bb2483aece@samsung.com>

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