CTS-237 WIP performance testing to validate new ARC algorithm

Fixing a typo in my previous patch - want to use setRenderTypeMask instead of
andRenderTypeMask.

Deminimis change, no review

indra/newview/llviewercontrol.cpp

@@ -148,7 +148,7 @@ static bool handleRenderPerfTestChanged(const LLSD& newvalue)
 	}
 	else 
 	{
-	gPipeline.andRenderTypeMask(LLPipeline::RENDER_TYPE_WL_SKY,
+		gPipeline.setRenderTypeMask(LLPipeline::RENDER_TYPE_WL_SKY,
 									  LLPipeline::RENDER_TYPE_GROUND,
 									  LLPipeline::RENDER_TYPE_TERRAIN,
 									  LLPipeline::RENDER_TYPE_GRASS,