Routing single track in differential pair uses dp clearance

[Seth Hillbrand]

In pcbnew, routing a single track to a DP-based net will use the DP clearance by default. The track should use the standard clearance value instead.

Application: eeschema
Version: (5.0.0-rc3-3-g9d4ceff), release build
Libraries:
    wxWidgets 3.0.4
    libcurl/7.54.0 LibreSSL/2.0.20 zlib/1.2.11 nghttp2/1.24.0
Platform: Mac OS X (Darwin 17.6.0 x86_64), 64 bit, Little endian, wxMac
Build Info:
    wxWidgets: 3.0.4 (UTF-8,STL containers,compatible with 2.8)
    Boost: 1.67.0
    OpenCASCADE Community Edition: 6.9.1
    Curl: 7.51.0
    Compiler: Clang 8.0.0 with C++ ABI 1002

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

[KiCad Janitor (kicad-janitor)]

Fixed in revision b8ae4e019578ff496f1d5ac308b12e8457b5c9ab
https://git.launchpad.net/kicad/patch/?id=b8ae4e019578ff496f1d5ac308b12e8457b5c9ab