Fix a shader glitch I left in when removing conditional defines. Fixes #3119 .

We ought to add more anisotropic filtering on normal textures with
parallax too or it breaks the effect too quickly.

This was SVN commit r16821.

binaries/data/mods/public/shaders/glsl/model_common.fs

@@ -129,7 +129,7 @@ void main()
     float height = 1.0;
     float scale = effectSettings.z;
 	  
-    int iter = int(min(30, 70.0/dist));
+    int iter = int(min(20, 25.0 - dist/10.0));
 	
 	if (iter > 0.01)
 	{