[tor-bugs] #29243 [Core Tor/Tor]: Fix minor bugs in the HSv3 unit tests

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#29243: Fix minor bugs in the HSv3 unit tests
-------------------------+-------------------------------------------------
     Reporter:  teor     |      Owner:  teor
         Type:  defect   |     Status:  assigned
     Priority:  Medium   |  Milestone:  Tor: unspecified
    Component:  Core     |    Version:  Tor: 0.3.2.1-alpha
  Tor/Tor                |   Keywords:  prop224, tor-hs, single-onion,
     Severity:  Normal   |  ipv6, 034-triage-20180328,
                         |  034-removed-20180328, fast-fix,
                         |  040-unreached-20190109, 041-proposed
Actual Points:  0.1      |  Parent ID:  #23576
       Points:  0.1      |   Reviewer:
      Sponsor:           |
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 The tests:
 * copy the first 20 characters of a 40-character hex string to a binary
 fingerprint
 * put IPv6 addresses in a variable called "ipv4"
 * do a duplicate tt_int_op() to deliberately fail and print a value,
 without a comment explaining the code

 Let's review these changes in #23576.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29243>
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