Clean up cruft in arc shader

shader/twoD/arc.vert

@@ -5,15 +5,10 @@ layout (location = 2) in vec4 saEaRadWdth;
 out vec4 vColor;
 out vec4 vparams;
 
-uniform vec2 winSize;
-uniform float zoom;
-uniform vec2 translation;
-uniform float rotation;
 uniform mat4 worldMat;
 
 void main()
 {
-  //gl_Position = worldMat * vec4(position.xyz,1);
   gl_Position = vec4(position.xyz,1);
   vColor = color;
   vparams = saEaRadWdth;