renderer: disable heat haze stage at load time

Author: illwieckz

src/engine/renderer/tr_shade.cpp

@@ -1975,11 +1975,6 @@ void Render_heatHaze( shaderStage_t *pStage )
 
 	GLimp_LogComment( "--- Render_heatHaze ---\n" );
 
-	if ( r_heatHaze->integer == 0 )
-	{
-		return;
-	}
-
 	// remove alpha test
 	stateBits = pStage->stateBits;
 	stateBits &= ~GLS_ATEST_BITS;

src/engine/renderer/tr_shader.cpp

@@ -5165,6 +5165,10 @@ static void FinishStages()
 				stage->active = false;
 				break;
 
+			case stageType_t::ST_HEATHAZEMAP:
+				stage->active = r_heatHaze->integer;
+				break;
+
 			case stageType_t::ST_LIQUIDMAP:
 				if ( !r_liquidMapping->integer )
 				{