Fix memory leak in IBus.Bus.get_global_engine()
Fix memory leak in IBus.Bus.get_global_engine()

Fix the memory leak by setting the transfer mode annotation to full.

BUG=https://github.com/ibus/ibus/pull/1899
R=Shawn.P.Huang@gmail.com

Review URL: https://codereview.appspot.com/312520043

Patch from Eric R. Schulz <eric@ers35.com>.

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