[hashcash] extra spaces with "-X"

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i first noticed this in 1.02, but didn't want to mention anything until checking a more recent version (testing now with 1.08)... in any case, it seems harmless but weird.

this seems to only affect the "X" option... when minting stamps, the output as padded with spaces...

  $ hashcash -mX foo | tr ' ' '*'
  X-Hashcash:*1:20:040913:foo::buzklS2p+dpWP/Mr:000043BI****************

quite a bit weirder when the header is folded...

  $ hashcash -mX foobar@xxxxxxxxxxxxx | tr ' ' '*'
  X-Hashcash:*1:20:040913:foobar@xxxxxxxxxxxxx::2d2cR4EE5niZ4oMeXynBBqya
          JfrWu:00002aR6************************************************


    ...atom

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