Inconsistent width for list selector

[chjohans]

When choosing a "Temperature source" for a "custom sensor" or a "curve", the selection list will dynamically change its width based on the widest entry in the list, depending on which part of the total list of available temperature sources are shown. This causes issues when using the scroll bar to move up and down in the list.

It would be better to keep the selection list wide enough to show the "widest" entry and keep that width when scrolling through the list.

See the attached screenshots that show the width when showing the first part of the list, and then the width when scrolling further down.

[chjohans]

This was for FanCOntrol not FanControl.HWInfo