Check spikeglx file size comparison

[JuliaSprenger]

@JuliaSprenger I just checked out all the files that @TomBugnon was using, and everything looks square to me. Using Python 3.7.12, os.stat(path).st_size properly reports uncompressed file size, matching SpikeGLX metadata content, for every file. @samuelgarcia How confident are you that this is the check that is leading to the warning in question?

Originally posted by @grahamfindlay in #1125 (comment)

[samuelgarcia]

Finally I think we need to remove it.
We will face many issues just because of this.
#1161