Fix SliderRow Layout problem

[akabab]

Changes the SliderRow's layout constraints to fit a 44pt cell, correctly aligned & centred.
Plus: valueLabel is now visible even if no title provided.

Before	After

This fixes #324

[mtnbarreto]

Hi @akabab , It would be great if we have the ability to show or not the value label. Could you implement it?

sometimes we want just to show the slider bar since the value doesn't matter or is shown in another view.

[cerupcat]

This only appears to fix this by putting the slider and text on the same line and doesn't allow for not showing a valueLabel. What if we want the current solution (where the slider is under), but also fix the current bug?

[m-revetria]

@cerupcat, please check this #1316 (comment)

[lukeleleh]

Any update for SliderRow's UI Bug?

[akabab]

@mtnbarreto Hey, sorry for the late reply. I've done small adds to show/hide the value label

[mtnbarreto]

Hi @akabab ! thanks for contributing!