Improve scanner view

scripts/shaders/Scanner.gdshader

@@ -6,7 +6,7 @@ shader_type canvas_item;
 uniform sampler2D gradient : source_color, filter_nearest; 
 uniform int dimension;
 
-const float alpha = 0.5;
+const float alpha = 0.7;
 const float strength = 0.5;
 const float pi = atan(1.0) * 4.0;
 const int samples = 35;