Path variables don't use relative user path

[ocb-hd-ccb]

When changing the username of a user on macOS the paths in "Configure Paths" do not update. Which means the user paths are hardcoded instead of using `~/whatever`.

I check a few other programs after updating my username and every program I check has updated correctly.

Obviously it wasn't very difficult to update 2 paths that were user relative but I thought I would still point it out.

```
Application: kicad
Version: (5.1.0-rc2-9-g37962b717), debug build
Libraries:
    wxWidgets 3.0.4
    libcurl/7.54.0 LibreSSL/2.6.4 zlib/1.2.11 nghttp2/1.24.1
Platform: Mac OS X (Darwin 18.2.0 x86_64), 64 bit, Little endian, wxMac
Build Info:
    wxWidgets: 3.0.4 (UTF-8,STL containers,compatible with 2.8)
    Boost: 1.68.0
    OpenCASCADE Community Edition: 6.9.1
    Curl: 7.54.0
    Compiler: Clang 9.0.0 with C++ ABI 1002

Build settings:
    USE_WX_GRAPHICS_CONTEXT=ON
    USE_WX_OVERLAY=ON
    KICAD_SCRIPTING=ON
    KICAD_SCRIPTING_MODULES=ON
    KICAD_SCRIPTING_PYTHON3=OFF
    KICAD_SCRIPTING_WXPYTHON=ON
    KICAD_SCRIPTING_WXPYTHON_PHOENIX=OFF
    KICAD_SCRIPTING_ACTION_MENU=ON
    BUILD_GITHUB_PLUGIN=ON
    KICAD_USE_OCE=ON
    KICAD_USE_OCC=OFF
    KICAD_SPICE=ON
```

[Michael Kavanagh (michaelkavanagh)]

I just tried using '~/' in the Configure Paths dialog and it worked fine for me. Does this not achieve what you need?

[Launchpad Janitor (janitor)]

[Expired for KiCad because there has been no activity for 60 days.]