changed assetPath to be a simple variable

Author: Cibbi

Editor/ShaderGenerator.cs

@@ -11,8 +11,6 @@ namespace VRLabs.ModularShaderSystem
 {
     public static class ShaderGenerator
     {
-        private static string assetPath;
-
         /// <summary>
         /// Generates a shader with all shader variants
         /// </summary>
@@ -73,7 +71,7 @@ public static void GenerateShader(string path, ModularShader shader, Action<Stri
 
                 foreach (Shader generatedShader in shader.LastGeneratedShaders.Where(x => x != null))
                 {
-                    assetPath = AssetDatabase.GetAssetPath(generatedShader);
+                    string assetPath = AssetDatabase.GetAssetPath(generatedShader);
                     if(string.IsNullOrWhiteSpace(assetPath))
                         File.Delete(assetPath);
                 }