changing PianoPedalBracket-style

[Stefan Thomas]

Dear community,
I've changed the PianoPedalBracket-style.
It works fine, but the end of the pedal-line isn't convincing for me.
Is there a way to change it?

\version "2.14.1"

right = {  c'1 }
left = { \clef bass
  \override Staff.PianoPedalBracket #'style = #'zigzag %works fine, only the ending isn't nice
  \override PianoStaff.PianoPedalBracket #'style = #'bracket \set PianoStaff.pedalSustainStyle = #'mixed
  \clef bass   c16->\sustainOn r16 r8  r4 r2 \sustainOff
}

\score {
  \new PianoStaff
  << \new Staff  \right
    \new Staff \left >>
}