Updated default value for SAMPLESPERPIXEL TIFF tag

[radarhere]

Resolves #5317

#5372 added this code, to raise an error when opening a TIFF image if the SAMPLESPERPIXEL didn't match the number of bits per sample - or if it were missing and the bits per sample wasn't 1.

Pillow/src/PIL/TiffImagePlugin.py

Lines 1253 to 1255 in ef9a8e5

	samplesPerPixel = self.tag_v2.get(SAMPLESPERPIXEL, 1)
	if len(bps_tuple) != samplesPerPixel:
	raise SyntaxError("unknown data organization")

This PR relaxes that, to allow through images where SAMPLESPERPIXEL is missing. I created a test image by just commenting out SAMPLESPERPIXEL when saving a TIFF.

Ping @wiredfool in case there was a reason for this that I'm not aware of.

[kkopachev]

@radarhere This is from #5364 (comment) (and next comment).
I think this change looks risky.
When forced in python code to self.use_load_libtiff=True, it fails to read.
Trying to open it using TIFFRGBAImageGet from libtiff also fails with Sorry, can not handle RGB image with Color channels=1 coming from https://gitlab.com/libtiff/libtiff/-/blob/master/libtiff/tif_getimage.c#L144

[kkopachev]

Perhaps less risky solution would be to handle OJPEG compressed images with special hacks around missing tags like LibTiff does https://gitlab.com/libtiff/libtiff/-/blob/master/libtiff/tif_dirread.c#L4081

[radarhere]

Thanks for reviewing. I've updated the commit with your suggestion.