Text of TextBlock In FormFieldNumberPicker shoue be binding

[jeffersyuan1976]

currently, the text is not using TemplateBinding to bind Title property. which is always display as "user"

<UserControl.Styles>
    <Style Selector="formFields|FormFieldNumberPicker">
        <Setter Property="Template">
            <ControlTemplate>
                <Grid Height="47">
                    <TextBlock
                        FontWeight="DemiBold"
                        HorizontalAlignment="Left"
                        Text="{TemplateBinding Title}"
                        VerticalAlignment="Center" />
                    <mobileNumberPicker:MobileNumberPicker
                        HorizontalAlignment="Right"
                        Margin="-30,0"
                        Maximum="{TemplateBinding Maximum}"
                        Minimum="{TemplateBinding Minimum}"
                        Value="{TemplateBinding Value,
                                                Mode=TwoWay}"
                        VerticalAlignment="Center" />
                </Grid>
            </ControlTemplate>
        </Setter>
    </Style>
</UserControl.Styles>