Fix syntax error

Dependencies

• [2] ACBS7C6Q hydra-queue-runner: Detect changes to the scheduling shares
• [3] GEADFVZ5 hydra-queue-runner: Improved scheduling
• [4] KN3VYE5P * Cleaned up the foreign key constraints.
• [5] SS4TZXNU Distinguish between permanent evaluation errors and transient input errors
• [*] N22GPKYT * Put info about logs / build products in the DB.

Change contents

• replacement in src/sql/hydra.sql at line 67
  [3.1325]→[2.1326:1358](∅→∅)
  − check schedulingShares > 0,
  [3.1325]

  [3.5479]
  + check (schedulingShares > 0),