Fix the reference error in Parameter

[seventil]

Instantiating EaElements.Parameter component as is results in a reference error:
EasyApp/src/EasyApplication/Gui/Elements/Parameter.qml:22:5: ReferenceError: parameterFieldWidth is not defined

This PR removes width definition from EaElements.Parameter, which results in a fallback on TextField's ImplicitWidth.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

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  Misses             ?     387           
  Partials           ?       0           

Flag	Coverage Δ
integration	0.00% <ø> (?)
unittests	0.00% <ø> (?)

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[seventil]

Also noticed an issue with padding in units. Here how regular text and degrees look currently

and here how they look with proposed topPadding added: