Fix bad format string

Dependencies

• [2] SL3WSRAC hydra-queue-runner: Limit memory usage
• [3] MB3TISH2 Rate-limit the number of threads copying closures at the same time

Change contents

• replacement in src/hydra-queue-runner/token-server.hh at line 42
  [2.2477]→[2.2477:2573](∅→∅)
  − throw NoTokens(format("requesting more tokens (%d) than exist (%d)") % tokens);
  [2.2477]

  [2.2573]
  + throw NoTokens(format("requesting more tokens (%d) than exist (%d)") % tokens % ts->maxTokens);