C#: Address review comments.

Author: michaelnebel

csharp/autobuilder/Semmle.Autobuild.Shared/MsBuildRule.cs

@@ -191,7 +191,7 @@ private static BuildScript DownloadNugetExe<TAutobuildOptions>(IAutobuilder<TAut
             })
             &
             BuildScript.DownloadFile(
-                FileUtils.nugetExeUrl,
+                FileUtils.NugetExeUrl,
                 path,
                 e => builder.Log(Severity.Warning, $"Failed to download 'nuget.exe': {e.Message}"))
             &

csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/NugetPackages.cs

@@ -83,7 +83,7 @@ private string DownloadNugetExe(string sourceDir)
             progressMonitor.LogInfo("Attempting to download nuget.exe");
             try
             {
-                FileUtils.DownloadFile(FileUtils.nugetExeUrl, nuget);
+                FileUtils.DownloadFile(FileUtils.NugetExeUrl, nuget);
                 progressMonitor.LogInfo($"Downloaded nuget.exe to {nuget}");
                 return nuget;
             }

csharp/extractor/Semmle.Util/FileUtils.cs

@@ -10,7 +10,7 @@ namespace Semmle.Util
 {
     public static class FileUtils
     {
-        public const string nugetExeUrl = "https://dist.nuget.org/win-x86-commandline/latest/nuget.exe";
+        public const string NugetExeUrl = "https://dist.nuget.org/win-x86-commandline/latest/nuget.exe";
 
         public static string ConvertToWindows(string path)
         {