pcbnew: plot dialog new (X2) settings not saved.

New plot options (Include extended (X2) attributes, Include advanced X2 features, Generate Gerber job file) are in "On" state by default and not saved in board file (although save icon becomes active after changing this option).

KiCad version - today git master, bug exist since new options introduction:
Application: pcbnew
Version: (2017-11-22 revision 821c02a)-master, release build
Libraries:
    wxWidgets 3.0.2
Platform: Linux 4.4.0-98-generic x86_64, 64 bit, Little endian, wxGTK
Build Info:
    wxWidgets: 3.0.2 (wchar_t,wx containers,compatible with 2.8) GTK+ 2.24
    Boost: 1.58.0
    Compiler: GCC 5.4.0 with C++ ABI 1009

Build settings:
    USE_WX_GRAPHICS_CONTEXT=OFF
    USE_WX_OVERLAY=OFF
    KICAD_SCRIPTING=OFF
    KICAD_SCRIPTING_MODULES=OFF
    KICAD_SCRIPTING_WXPYTHON=OFF
    KICAD_SCRIPTING_ACTION_MENU=OFF
    BUILD_GITHUB_PLUGIN=OFF
    KICAD_USE_OCE=OFF
    KICAD_SPICE=OFF