Remove obsolete handler

src/database-backends/postgresql/index.js

@@ -102,10 +102,6 @@ module.exports = function(state) {
 										}).then(() => {
 											debug(`Task '${task.name}:${id}' locked successfully`);
 											return true;
-										}).catch({ name: "UniqueViolationError" }, () => {
-											// FIXME: This is not the correct error...
-											debug(`Task '${task.name}:${id}' failed lock because already locked on write`);
-											return false;
 										});
 									} else {
 										debug(`Task '${task.name}:${id}' failed lock because already locked on read`);