TimeField does not implement Dim.Auto correctly

[tznind]

Describe the bug
Results in width 0

To Reproduce
Add 2 time views one with width Dim.Auto one with fixed width

Expect to see 2 time fields

Actually see only one (the one with the absolute)

        Application.Init ();

        var win = new Window ()
        {
            Title = "My Window",
            X = 0,
            Y = 0,
            Width = Dim.Fill (),
            Height = Dim.Fill ()
        };

        win.Add (
                 new TimeField ()
                 {
                     Y = 1,
                     Width = 10
                 });
        win.Add (
                 new TimeField ()
                 {
                     Y = 2,
                     Width = Dim.Auto ()
                 });

        Application.Run (win);
        Application.Shutdown ();

Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
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