prevent per-window alpha menu from scrolling past 0 or 255:

suppose your alpha was at 3 and then you double-clicked -- IntResMenuItem was
setting the alpha to -2, which in FbWinFrame::setAlpha got cast to an unsigned
char, or 254; then, IntResMenuItem would check if the value was less than 0,
which, of course, it wasn't
now, IntResMenuItem checks if the value will exceed the max/min before setting

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