[tor-bugs] #21429 [Metrics/Atlas]: Remove line breaks in graph data URIs

[Tor Bug Tracker & Wiki]

#21429: Remove line breaks in graph data URIs
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     Reporter:  cypherpunks    |      Owner:  irl
         Type:  defect         |     Status:  new
     Priority:  Medium         |  Milestone:
    Component:  Metrics/Atlas  |    Version:
     Severity:  Normal         |   Keywords:
Actual Points:                 |  Parent ID:  #21274
       Points:                 |   Reviewer:
      Sponsor:                 |
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 On the details page each `Save Graph` links to a data URI with a line
 break which is a bad value according to the W3C validator.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21429>
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