Update key persistence location for data protection configuration

Author: KrzysztofPajak

src/Web/Grand.Web.Common/Infrastructure/ServiceCollectionExtensions.cs

@@ -121,8 +121,10 @@ public static void AddGrandDataProtection(this IServiceCollection services, ICon
         {
             var securityConfig = new SecurityConfig();
             configuration.GetSection("Security").Bind(securityConfig);
+            var defaultKeyPath = Path.Combine(AppContext.BaseDirectory, "App_Data", "DataProtectionKeys");
             var keyPersistenceLocation = string.IsNullOrEmpty(securityConfig.KeyPersistenceLocation)
-                ? "/App_Data/DataProtectionKeys" : securityConfig.KeyPersistenceLocation;
+                ? defaultKeyPath
+                : securityConfig.KeyPersistenceLocation;
             var dataProtectionKeysFolder = new DirectoryInfo(keyPersistenceLocation);
             //configure the data protection system to persist keys to the specified directory
             services.AddDataProtection().PersistKeysToFileSystem(dataProtectionKeysFolder);