Set destroyed=true in opt locking's destroy [#5058 state:resolved]

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

activerecord/lib/active_record/locking/optimistic.rb

@@ -128,6 +128,7 @@ def destroy_with_lock #:nodoc:
             end
           end
 
+          @destroyed = true
           freeze
         end
 

activerecord/test/cases/locking_test.rb

@@ -53,7 +53,8 @@ def test_lock_destroy
     assert_raises(ActiveRecord::StaleObjectError) { p2.destroy }
 
     assert p1.destroy
-    assert_equal true, p1.frozen?
+    assert p1.frozen?
+    assert p1.destroyed?
     assert_raises(ActiveRecord::RecordNotFound) { Person.find(1) }
   end