[OSG] Smoke effect invisible through transparent leaves

The smoke effect is invisible when you look through transparent leaves, e.g. flora_bc_tree_08 in Seyda Neen.

OpenMW version: OSG 64bit rev 5d696204c4, by Ananace

OS: Windows 10 64bit GPU: Geforce GTX 570

(RM-2631 from redmine: created on 2015-06-08 by Thomas Staudinger, , closed on 2015-06-08 by scrawl .)

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