Footprint preview should not use 'contrast mode'
Description
When 'contrast mode' is enabled in pcbnew, the footprint preview picks up that setting, but looks like this ....
Disabling 'contrast mode in the main editor (and re-opening the footprint chooser dialog) will show something more useful:
KiCad Version
Application: Pcbnew
Version: 5.99.0-unknown-r19130-2af6d01f, debug build
Libraries:
wxWidgets 3.0.4
libcurl/7.66.0 OpenSSL/1.1.1g-fips zlib/1.2.11 brotli/1.0.7 libidn2/2.3.0 libpsl/0.21.0 (+libidn2/2.2.0) libssh/0.9.4/openssl/zlib nghttp2/1.41.0
Platform: Linux 5.7.9-100.fc31.x86_64 x86_64, 64 bit, Little endian, wxGTK
Build Info:
Date: Jul 25 2020 17:40:13
wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8) GTK+ 3.24
Boost: 1.69.0
OCC: 7.4.0
Curl: 7.66.0
ngspice: 32
Compiler: GCC 9.3.1 with C++ ABI 1013
Build settings:
KICAD_SCRIPTING=ON
KICAD_SCRIPTING_MODULES=ON
KICAD_SCRIPTING_PYTHON3=ON
KICAD_SCRIPTING_WXPYTHON=ON
KICAD_SCRIPTING_WXPYTHON_PHOENIX=ON
KICAD_SCRIPTING_ACTION_MENU=ON
BUILD_GITHUB_PLUGIN=ON
KICAD_USE_OCC=ON
KICAD_SPICE=ON
KICAD_STDLIB_DEBUG=OFF
KICAD_STDLIB_LIGHT_DEBUG=OFF
KICAD_SANITIZE=OFF