log-manager: pass the right source_tag to g_simple_async_result_new
log-manager: pass the right source_tag to g_simple_async_result_new

Convention is to pass the _async method, not the _finish one.

freedesktop-unofficial-mirror/telepathy__telepathy-logger,freedesktop-unofficial-mirror/telepathy__telepathy-logger,freedesktop-unofficial-mirror/telepathy__telepathy-logger