fix zone specs

by reenabling task before the next spec is run

spec/lib/tasks/populate_zones_spec.rb

@@ -3,6 +3,9 @@ describe 'populate_zones' do
   subject(:run_task) do
     rake_task.invoke
   end
+  after(:each) do
+    rake_task.reenable
+  end
 
   it 'populates zones' do
     run_task

spec/services/update_zone_to_procedures_service_spec.rb

@@ -1,10 +1,10 @@
 describe UpdateZoneToProceduresService do
-  before(:all) do
+  before(:each) do
     Rake::Task['zones:populate_zones'].invoke
   end
 
-  after(:all) do
-    Zone.destroy_all
+  after(:each) do
+    Rake::Task['zones:populate_zones'].reenable
   end
 
   describe '#call' do