zb: Don't hardcode fallback session bus address
If DBUS_SESSION_BUS_ADDRESS env is not set, don't assume runtime dir to be a specific value and try to take it from XDG_RUNTIME_DIR first.
Fixes #191 (closed).
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If DBUS_SESSION_BUS_ADDRESS env is not set, don't assume runtime dir to be a specific value and try to take it from XDG_RUNTIME_DIR first.
Fixes #191 (closed).