No need for processing behavior to be virtual

Author: JimBobSquarePants

src/ImageSharp.Web/Providers/FileProviderImageProvider.cs

@@ -42,7 +42,7 @@ protected FileProviderImageProvider(IFileProvider fileProvider, ProcessingBehavi
         }
 
         /// <inheritdoc/>
-        public virtual ProcessingBehavior ProcessingBehavior { get; }
+        public ProcessingBehavior ProcessingBehavior { get; }
 
         /// <inheritdoc/>
         public virtual Func<HttpContext, bool> Match { get; set; } = _ => true;