Update SuiteValue.UI.Metro/Controls/TimePicker.cs

Fixed bug with copying 12-hour time.
Update SuiteValue.UI.Metro/Controls/TimePicker.cs

In case hour is 12.
Update TimePicker.cs

Okay, got it right this time.  Tested it, too.
Merge pull request #4 from HappyNomad/patch-1

Update SuiteValue.UI.Metro/Controls/TimePicker.cs