BUS_RESULT: fix missed changes of TRUE/FALSE to BUS_RESULT

BUS_RESULT: fix missed changes of TRUE/FALSE to BUS_RESULT

The Tizen's branch code that added Cynara integration had changed
return types in some functions from dbus_bool_t to BusResult. The code
from upstream master branch uses dbus_bool_t. While merging recent
changes from the upstream, there were some parts that were merged
without changing TRUE/FALSE to BUS_RESULT_* or with checking conditions
as bool values instead of checking the enum.

The above, and the fact that TRUE==1, FALSE==0, BUS_RESULT_TRUE==0,
BUS_RESULT_FALSE==1 has led to aborting on asserts, when enabled.
This could also lead to issues with activation.

This commit fixes the TRUE/FALSE handling where needed.

Change-Id: I6cbf1aa0b43699464c9214b50fd8bb23a84709e8