Allow locksmith delete to work with strings (#615)

Previously if `call_script(:delete)` was returning a string an
error was raised since we couldn't call `.positive?` on it.

This change will ensure call script will always return a number.

lib/sidekiq_unique_jobs/locksmith.rb

@@ -81,7 +81,7 @@ def delete
     # Deletes the lock regardless of if it has a pttl set
     #
     def delete!
-      call_script(:delete, key.to_a, [job_id, config.pttl, config.type, config.limit]).positive?
+      call_script(:delete, key.to_a, [job_id, config.pttl, config.type, config.limit]).to_i.positive?
     end
 
     #

spec/sidekiq_unique_jobs/locksmith_spec.rb

@@ -181,6 +181,14 @@
       expect(locksmith_one).not_to be_locked
     end
 
+    it "allows deletion when call script returns a string" do
+      locksmith_one.lock
+      allow(locksmith_one).to receive(:call_script).and_return("120")
+      locksmith_two.delete!
+
+      expect(locksmith_one).not_to be_locked
+    end
+
     context "when lock_timeout is zero" do
       let(:lock_timeout) { 0 }