DEV: Take 2 Queue jobs in tests by default.

On my machine this cuts the time taken to run our test suite
from ~11mins to ~9mins.

spec/models/topic_timer_spec.rb

@@ -176,6 +176,10 @@ RSpec.describe TopicTimer, type: :model do
         )
       end
 
+      before do
+        SiteSetting.queue_jobs = false
+      end
+
       it 'should close the topic' do
         topic_timer
         expect(topic.reload.closed).to eq(true)
@@ -201,6 +205,10 @@ RSpec.describe TopicTimer, type: :model do
         )
       end
 
+      before do
+        SiteSetting.queue_jobs = false
+      end
+
       it 'should open the topic' do
         topic_timer
         expect(topic.reload.closed).to eq(false)
@@ -239,10 +247,6 @@ RSpec.describe TopicTimer, type: :model do
   end
 
   describe '.ensure_consistency!' do
-    before do
-      SiteSetting.queue_jobs = true
-    end
-
     it 'should enqueue jobs that have been missed' do
       close_topic_timer = Fabricate(:topic_timer,
         execute_at: Time.zone.now - 1.hour,