Fix query handling for /oic/res

Fix query handling for /oic/res

There was a mix up when query was supplied, it was only working if the interfaceQuery passed too. With just rt supplied,
it was returning all the resource. This patch fixes up the issue.

Change-Id: I980f0dd73fafdadd3d1dabae5edf024ac256f95c
Signed-off-by: Habib Virji <habib.virji@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/14759
Reviewed-by: Mushfiqul Islam <i.mushfiq@samsung.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Phil Coval <philippe.coval@osg.samsung.com>