Based on Bluetooth spec Vol3 PartB 5.1.7 the BrowseGroupList consists
of a data element sequence. The current approach was not correct.

This was discovered because Bluez5 doesn't add a custom service to the
Extended Inquiry Response (EIR) unless it is in a sequence. If the
service is not part of the EIR other platforms such as Windows report
an error or won't simply see the service.

This was not a problem when using Bluez4 because it was more
tolerant towards such mistakes and added the custom service to the EIR
anyway.

Task-number: QTBUG-43806
Change-Id: Ib0ca59005c940249fb6aefd8ecafe5b2ceff3878
Reviewed-by: Aaron McCarthy <mccarthy.aaron@gmail.com>