sl0ppty: plain ASCII for the frame's buttons

_ for minimise, # for zoom, * for the way back, x for close.

Box-drawing and block characters were each tried and each looked unevenly
spaced, which is the answer: the cells are even every time, and what differs is
how much of its own cell a glyph fills. That is a property of the font, not
something to be fixed from here, and single-width ASCII of a similar weight is
the way to stop asking the question.

The measurement stays, so a mark is still yours to change and may be more than
one character. The config note now says what the three attempts established
rather than what I expected each time.

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