Fix regression caused by ee2e9f53

Dependencies

• [2] IKJBYIGY Update to reflect BinaryCacheStore changes
• [3] 73YR46NJ hydra-queue-runner: Write directly to a binary cache
• [4] BYVRA54Q Temporarily disable machines on any exception, not just connection failures
• [5] 5AIYUMTB Basic remote building

Change contents

• replacement in src/hydra-queue-runner/build-remote.cc at line 205
  [3.2491]→[2.157:233](∅→∅)
  − copyClosure(ref<Store>(localStore), destStore, basicDrv.inputSrcs);
  [3.2491]

  [3.3876]
  + copyClosure(ref<Store>(localStore), destStore, step->drv.inputSrcs);