Remove write method from test

[radarhere]

Extracted from #9803

Pillow/Tests/test_image.py

Lines 197 to 209 in 8f86212

	class FP(io.BytesIO):
	name: Path
	if sys.version_info >= (3, 12):
	from collections.abc import Buffer
	def write(self, data: Buffer) -> int:
	return len(data)
	else:
	def write(self, data: Any) -> int:
	return len(data)

The write method was originally added in #2227. I guess it became redundant after #8163 changed FP to inherit from io.BytesIO.

[akx]

Looks like an excellent change, if I do say so myself! 😁