[removeOverlaps] Fix CFF CharString width

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

Lib/fontTools/ttLib/removeOverlaps.py

@@ -87,7 +87,8 @@ def ttfGlyphFromSkPath(path: pathops.Path) -> _g_l_y_f.Glyph:
 def _charString_from_SkPath(
     path: pathops.Path, charString: T2CharString
 ) -> T2CharString:
-    t2Pen = T2CharStringPen(width=charString.width, glyphSet=None)
+    width = charString.width - charString.private.nominalWidthX
+    t2Pen = T2CharStringPen(width=width, glyphSet=None)
     path.draw(t2Pen)
     return t2Pen.getCharString(charString.private, charString.globalSubrs)