reduce brightness of starfield

assets/shader/starfield.fs

@@ -13,7 +13,7 @@ uniform float zoom;
 #define sparsity 0.5f
 #define stepsize 0.3f
 #define frequency_variation 1.3f
-#define brightness 0.0018f
+#define brightness 0.00068f
 #define distfading 0.68f
 
 void main() {