SHA1 Case issue

[Chun-Hung Tseng]

rclone/rclone#7345

[Tom Raganowicz]

I was wondering if solution mentioned here: rclone/rclone#7345 (comment)

Replace:
https://github.com/rclone/rclone/blob/master/fs/operations/operations.go#L119

return srcHash == dstHash, ht, srcHash, dstHash, nil

with

return strings.ToUpper(srcHash) == strings.ToUpper(dstHash), ht, srcHash, dstHash, nil

solves this problem?

[Tom Raganowicz]

I've created pull request: #27 but given that I couldn't exactly reproduce this issue (no idea in which case Proton would return uppercase SHA1 instead of lowercased one) it is somewhat blind fix.