hydra-notify: fixup printing of build IDs

Dependencies

• [2] T3OHZDYP hydra-notify: move BuildFinished processing to an Event
• [3] 32KJOERM Turn hydra-notify into a daemon
• [4] IE2PRAQU hydra-queue-runner: Send build notifications
• [5] GE7LFZHQ hydra-notify: move buildFinished query in to the function impl

Change contents

• replacement in src/script/hydra-notify at line 53
  [3.2466]→[2.1391:1459](∅→∅)
  − print STDERR "sending notifications for build $build->id...\n";
  [3.2466]

  [2.1459]
  + print STDERR "sending notifications for build ${\$build->id}...\n";