Server: Back off reading logs in the log tab on error

[jscheidtmann]

If the log file cannot be found, back off to 10s intervals, instead of hammering the web server with requests.

• Test on physical PiFinder unit.

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• main
  • Fix empty logs #400
    • Server: Back off reading logs in the log tab on error 👈
      • webserver: Upload and choose log configuration #404

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