Minor: Inconsistent coloring of sheets marked DNP in plots

Description

Sheets marked DNP are plotted differently than they appear on screen. The sheet's fields are dimmed on screen, but not in the plot. Same goes for the shapes of the sheet icons.

Plot on the left:

KiCad Version

Application: KiCad x86_64 on x86_64

Version: 10.0.0-rc2, release build

Libraries:
	wxWidgets 3.2.10 GLX
	FreeType 2.14.1
	HarfBuzz 11.4.5
	FontConfig 2.17.1
	libcurl/8.15.0 OpenSSL/3.5.4 zlib/1.3.1 zstd/1.5.7 libidn2/2.3.8 libpsl/0.21.5 nghttp2/1.66.0

Platform: GNOME 49 (Flatpak runtime), 64 bit, Little endian, wxGTK, X11, x11, KDE, KDE

Build Info:
	Date: Nov 11 2011 11:11:11
	wxWidgets: 3.2.10 (wchar_t,wx containers) GTK+ 3.24
	Boost: 1.90.0
	OCC: 7.9.3
	Curl: 8.15.0
	ngspice: 45.2
	Compiler: GCC 15.2.0 with C++ ABI 1020
	KICAD_IPC_API=ON
	KICAD_USE_PCH=OFF

Locale: 
	Lang: en_US
	Enc: UTF-8
	Num: 1.234,5
	Encoded кΩ丈: D0BACEA9E4B888 (sys), D0BACEA9E4B888 (utf8)