Fix Resque::Scheduler.print_schedule

Added in 893f13c, this is intended to help with debugging. The `:t` and `:last` attrs were removed in the jmettraux/rufus-scheduler@v2.0.24...v3.0.0

It seems `#print_schedule` likely hasn't worked since the `rufus-scheduler` depenency was bumped to require ~3.0 in d24657e#diff-9732d81ad66d6656923a3883e83f6620a3b16a07484745677a0776f6e0bff025.

This fixes the `OpenStruct` warnings seen in tests for newer Ruby versions.

lib/resque/scheduler.rb

@@ -86,8 +86,8 @@ def print_schedule
         if rufus_scheduler
           log! "Scheduling Info\tLast Run"
           scheduler_jobs = rufus_scheduler.jobs
-          scheduler_jobs.each do |_k, v|
-            log! "#{v.t}\t#{v.last}\t"
+          scheduler_jobs.each do |job|
+            log! "#{job.opts}\t#{job.last_time}\t"
           end
         end
       end

test/scheduler_test.rb

@@ -589,15 +589,15 @@ def enqueue_started!
 
   context 'printing schedule' do
     setup do
-      Resque::Scheduler.expects(:log!).at_least_once
+      Resque::Scheduler.stubs(:log!)
     end
 
     test 'prints schedule' do
-      fake_rufus_scheduler = mock
-      fake_rufus_scheduler.expects(:jobs).at_least_once
-                          .returns(foo: OpenStruct.new(t: nil, last: nil))
-      Resque::Scheduler.expects(:rufus_scheduler).at_least_once
-                       .returns(fake_rufus_scheduler)
+      rufus_scheduler = Rufus::Scheduler.new
+      fake_job = rufus_scheduler.at(Time.now + 1, job: true) {}
+      Resque::Scheduler.expects(:rufus_scheduler).at_least_once.returns(rufus_scheduler)
+      Resque::Scheduler.expects(:log!).with("#{fake_job.opts}\t#{fake_job.last_time}\t")
+
       Resque::Scheduler.print_schedule
     end
   end