fixed MultiImageBenchmarkBase based benchmarks

tests/ImageSharp.Benchmarks/Image/MultiImageBenchmarkBase.cs

@@ -46,7 +46,7 @@ namespace ImageSharp.Benchmarks.Image
         /// <summary>
         /// Gets the file names containing these strings are substrings are not processed by the benchmark.
         /// </summary>
-        protected IEnumerable<string> ExcludeSubstringsInFileNames => new string[] { };
+        protected IEnumerable<string> ExcludeSubstringsInFileNames => new[] { "badeof", "BadEof" };
 
         /// <summary>
         /// Enumerates folders containing files OR files to be processed by the benchmark.