message: Fix Enter in Find not working on macOS
  Fixes
diff: @@ -185,6 +185,7 @@ FindFrame::FindFrame(PoeditFrame *owner,
  { wxACCEL_SHIFT, WXK_RETURN, m_btnPrev->GetId() },
  #endif
  #ifdef __WXOSX__
  + { wxACCEL_NORMAL, WXK_RETURN, m_btnNext->GetId() },
  { wxACCEL_CMD, 'W', wxID_CLOSE },
  #endif
  { wxACCEL_NORMAL, WXK_ESCAPE, wxID_CLOSE }
  @@ -213,6 +214,9 @@ FindFrame::FindFrame(PoeditFrame *owner,
  // differently. More than a bit of a hack, but it works.
  NSButton *macPrev = (NSButton*)m_btnPrev->GetHandle();
  Bind(wxEVT_MENU, [=](wxCommandEvent&){ [macPrev performClick:nil]; }, m_btnPrev->GetId());
  +
  + NSButton *macNext = (NSButton*)m_btnNext->GetHandle();
  + Bind(wxEVT_MENU, [=](wxCommandEvent&){ [macNext performClick:nil]; }, m_btnNext->GetId());
  #endif
  OnModeChanged();
  