update materials

valve/pbr/mirror.mat

@@ -11,6 +11,8 @@
 "for" "mirror_broken" // TODO: normal, displacement, metalness, roughness maps
 "new" "mirror_broken"
 "basecolor_map" "/colors/white.png"
+"normal_map" "mirror_broken_normal.png" // TODO: better texture
+//"normal_scale" "0.1"
 "metalness" "1"
 "roughness" "0"
 }