Folders rename for consistency on shaders version

shaders/gl330/grayscale.fs

@@ -1,20 +0,0 @@
-#version 330
-
-in vec2 fragTexCoord;
-
-out vec4 fragColor;
-
-uniform sampler2D texture0;
-uniform vec4 fragTintColor;
-
-// NOTE: Add here your custom variables
-
-void main()
-{
-    vec4 base = texture(texture0, fragTexCoord)*fragTintColor;
-    
-    // Convert to grayscale using NTSC conversion weights
-    float gray = dot(base.rgb, vec3(0.299, 0.587, 0.114));
-    
-    fragColor = vec4(gray, gray, gray, fragTintColor.a);
-}