eeschema: wire width changed, and is not saved

Description

Since recently, each time I open a schematic all the wire widths have changed to be thinner than the pins:

Changing Wire thickness from 0.127 mm to 0.15 mm in File > Schematic Setup > Net Classes brings it back to normal. But the next time I open the project it's back to 0.127 mm again.

So I guess there's two issues in one here:

1. Default to 0.15 mm to match the pin widths.
2. Save the user configured widths.

KiCad Version

Application: KiCad Schematic Editor

Version: (5.99.0-10226-g7d58c53e42), debug build

Libraries:
	wxWidgets 3.0.4
	libcurl/7.68.0 OpenSSL/1.1.1f zlib/1.2.11 brotli/1.0.7 libidn2/2.2.0 libpsl/0.21.0 (+libidn2/2.2.0) libssh/0.9.3/openssl/zlib nghttp2/1.40.0 librtmp/2.3

Platform: Linux 5.8.0-48-generic x86_64, 64 bit, Little endian, wxGTK, xubuntu, x11

Build Info:
	Date: Apr 11 2021 22:04:46
	wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8) GTK+ 3.24
	Boost: 1.71.0
	OCC: 7.3.0
	Curl: 7.68.0
	ngspice: 31
	Compiler: GCC 9.3.0 with C++ ABI 1013

Build settings:
	KICAD_SCRIPTING=OFF
	KICAD_SCRIPTING_MODULES=OFF
	KICAD_SCRIPTING_PYTHON3=OFF
	KICAD_SCRIPTING_WXPYTHON=OFF
	KICAD_SCRIPTING_WXPYTHON_PHOENIX=OFF
	KICAD_SCRIPTING_ACTION_MENU=OFF
	KICAD_USE_OCC=ON
	KICAD_SPICE=ON
	KICAD_STDLIB_DEBUG=OFF
	KICAD_STDLIB_LIGHT_DEBUG=OFF
	KICAD_SANITIZE=OFF