[obexd] Disable SRM. Fixes JB#9623.

Quick hack to ensure that client sends an abort when a transfer
is canceled. If SRM is enabled, aborting transfers seems buggy
if the D-Bus client cancels a transfer and immediately afterwards
releases its session.
Merge pull request #6 from hmallat/OPP-disable-SRM

[obexd] Disable SRM. Fixes JB#9623.