Fix SDP BrowseGroupList entry

A BrowseGroupList is defined as sequence in which each element is a UUID
that represents a browse group to which the service record belongs.
Except for the QBluetoothServer::listen() implementation every other
implementation did not use the sequence pattern. This patch unifies
all BrowseGroupList entries through QtBluetooth and its examples/tests.

Change-Id: I37640ae0500c557d79350359883abc6a66a46346
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>