NuGet.Server 2.10.1: drop folder does not work

NuGet/NuGetGallery#2969

Author: maartenba

src/NuGet.Server/Infrastructure/ServerPackageRepository.cs

@@ -639,7 +639,7 @@ private void FileSystemChanged(object sender, FileSystemEventArgs e)
 
             // 1) If a .nupkg is dropped in the root, add it as a package
             if (String.Equals(Path.GetDirectoryName(e.FullPath), _fileSystemWatcher.Path, StringComparison.OrdinalIgnoreCase)
-                && String.Equals(Path.GetExtension(e.Name), "nupkg", StringComparison.OrdinalIgnoreCase))
+                && String.Equals(Path.GetExtension(e.Name), ".nupkg", StringComparison.OrdinalIgnoreCase))
             {
                 // When a package is dropped into the server packages root folder, add it to the repository.
                 AddPackagesFromDropFolder();