[kdbus][TEMPORARY HACK] Disable 'initial read'

This patch allows perform new API test [1] without errors.
'initial_read' should be disabled till old patches from
Tizen repo [2] will be applied in this GitHub repository.

[1] https://github.com/lukasz-skalski/glib-kdbus-tests
[2] https://review.tizen.org/git/?p=platform/upstream/glib.git;a=shortlog;h=refs/heads/kdbus-integration