hydra: fix enable email notification bug

Dependencies

• [2] FYO6NECE hydra
• [3] OG7BEM57
• [4] KA45EBF5 * Send email if a build fails.
• [*] 7YBYT2LQ

Change contents

• replacement in src/script/hydra_build.pl at line 85
  [3.79]→[2.3721:3790](∅→∅)
  − return if !($build->maintainers || $build->jobset->enableemail);
  [3.79]

  [3.115]
  + return if !($build->maintainers && $build->jobset->enableemail);