Clean up FastRenderSample attributes #1337

Job	Run time
mypy	22s
sdist	1m 10s
ruff	7s
parse_sdl (windows-latest, 3.2.16)	55s
parse_sdl (macos-latest, 3.2.16)	32s
test-docs	2m 5s
pyodide	2m 43s
tox (ubuntu-latest)	2m 16s
linux-wheels (x86_64, pp310-manylinux*)	3m 36s
build-macos (cp310-*_universal2)	2m 46s
build-macos (pp310-*)	4m 42s
build (windows-latest, 3.10, x64)	3m 25s
build (windows-latest, pypy-3.10, x64)	3m 52s
linux-wheels (aarch64, pp310-manylinux*)	3m 30s
linux-wheels (x86_64, cp310-manylinux*)	3m 59s
build (ubuntu-latest, pypy-3.10, x64)	3m 22s
linux-wheels (aarch64, cp310-manylinux*)	4m 9s
build (ubuntu-latest, 3.10, x64)	3m 42s
build (windows-latest, 3.10, x86)	4m 16s
publish	0s
	51m 29s

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