fixed EXT-1914 "IM Floaters lost ANCHORS to their chiclets and are not dockable."

--HG--
branch : product-engine

indra/newview/llimfloater.cpp

@@ -265,7 +265,7 @@ void LLIMFloater::draw()
 		}
 	}
 
-	LLFloater::draw();
+	LLTransientDockableFloater::draw();
 }