faces: set maximum width for arbitrary input spinboxes

The angle spinboxes for piechart and the duration spinbox for linechart allow arbitrary input, but use default (implicit) sizing. This means that user input is not constrained by the from/to settings of the spinbox, and the width of the control can grow without bounds, even beyond the constraints of the window. Such large inputs are generally pointless (and will likely fail anyway when the spinbox input is parsed). But we can fix the graphical glitch to look less broken.

This change sets a maximum value for the length of these spinboxes that matches the fixed-width spinboxes used on their pages.

BUG: 467813 FIXED-IN: 6.4.0

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