[NTG-context] metafun paralleled does not give a parallel path

[fv leung]

The following used to produce three parallel lines.
Now it produces one straight line and two arcs.

\starttext

\startMPcode
  z0 = origin;
  z1 = 72dir(45);
  dotlabel.bot("z0", z0);
  draw z0--z1;
  draw (z0--z1) paralleled -15 withcolor red;
  draw (z0--z1) paralleled 15 withcolor blue;
\stopMPcode

\stoptext
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