Tick(estimatedDuration, message) does not update EstimatedDuration

[JamieKitson]

Compare:

		public void Tick(TimeSpan estimatedDuration, string message = null)
		{
			Interlocked.Increment(ref _currentTick);
			FinishTick(message);
		}
		public void Tick(int newTickCount, TimeSpan estimatedDuration, string message = null)
		{
			Interlocked.Exchange(ref _currentTick, newTickCount);
			_estimatedDuration = estimatedDuration;

			FinishTick(message);
		}

shellprogressbar/src/ShellProgressBar/ProgressBarBase.cs

Line 127 in c28355f

public void Tick(TimeSpan estimatedDuration, string message = null)