Bugfix: made sure LOS is always thresholded to black

This was SVN commit r12561.

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

@@ -246,6 +246,7 @@ void main()
 
   #if !IGNORE_LOS
     float los = texture2D(losTex, v_los).a;
+    los = los < 0.01 ? 0.0 : los;
     color *= los;
   #endif
 

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

@@ -219,6 +219,7 @@ void main()
   #endif
 
   float los = texture2D(losTex, v_los).a;
+  los = los < 0.01 ? 0.0 : los;
   color *= los;
 
   #if DECAL

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

@@ -53,6 +53,7 @@ void main()
 	specular = pow(max(0.0, ndoth), shininess) * sunColor * specularStrength;
 
 	losMod = texture2D(losMap, gl_TexCoord[3].st).a;
+	losMod = losMod < 0.01 ? 0.0 : losMod;
 
 	gl_FragColor.rgb = mix(refrColor + 0.3*specular, reflColor + specular, fresnel) * losMod;