The width argument of `T2CharStringPen()` is inserted directly into the
CharString program, so it must be relative to Private.nominalWidthX, but
CharString.width is a calculated absolute value.
Some implementations, notably Adobe’s, will use the width from the CFF
CharString instead of the one from hmtx table.
Fixes https://github.com/fonttools/fonttools/issues/3658
40b525c1e3