Move label position leftward for numberinputs when controls-alignment="right"

[xiaoxiao99]

Description

Currently, for numberinputs with controls-alignment="right", the label position is misaligned with other types of inputs.

Code pen live example is here
https://codepen.io/xiaoxiao22/pen/zYjzXPx

It makes sense to align label with others for this specific case.

Why Buefy need this feature

Buefy looks even better!

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