fix: correct attribute name in register function (closes #659)

[botbikamordehai2-sketch]

What

In the register function of fabioformats.py, codec_class.codec_name() is called as a method, but codec_name is a property (attribute) in the FabioImage class, not a method. This causes an AttributeError or TypeError when registering codecs, breaking format discovery.

Fix

Changed codec_class.codec_name() to codec_class.codec_name to access the attribute correctly.

Closes #659

[kif]

Yo bot ! What did you smoke ?
FabioImage.codec_name is a class-method, not a property, your comprehension of the code base of FabIO looks close to null and your understanding of Python rather limited, You should consider changing your LLM !
Finally it has nothing to do with the this issue you linked.