Fix issue with WatchDispose test that had a race condition that may result in test failing (#427)

Author: macsux

tests/KubernetesClient.Tests/WatchTests.cs

@@ -263,7 +263,6 @@ public async Task DisposeWatch()
                     await Task.Yield();
                 }
 
-                Assert.Empty(events);
                 Assert.False(watcher.Watching);
                 Assert.True(connectionClosed.IsSet);
             }