Fix Success result from Uninstall.

Src/Core/API/Base/Env.cs

@@ -1151,6 +1151,7 @@
         private void LockedUninstall(IEnumerable<ProgramName> progs, out InstallResult result)
         {
             result = new InstallResult();
+            result.Succeeded = true;
             if (progs == null)
             {
                 return;