Fix passing a block to advisory_lock in tests (#1587)

This method does not take a block. As such, the expectation is never executed

Author: Earlopain

spec/app/models/concerns/good_job/advisory_lockable_spec.rb

@@ -483,9 +483,8 @@
 
       it "locks and unlocks" do
         GoodJob::Job.transaction do
-          job.advisory_lock(function: "pg_advisory_xact_lock") do
-            expect(job.advisory_locked?).to be true
-          end
+          job.advisory_lock(function: "pg_advisory_xact_lock")
+          expect(job.advisory_locked?).to be true
         end
         expect(job.advisory_locked?).to be false
       end