test: less fragile integration suite [ci skip]

See coop-cloud/organising#584
See coop-cloud/organising#595

tests/integration/app_list.bats

@@ -18,10 +18,7 @@ setup(){
 }
 
 teardown(){
-  # https://github.com/bats-core/bats-core/issues/383#issuecomment-738628888
-  if [[ -z "${BATS_TEST_COMPLETED}" ]]; then
-    _undeploy_app
-  fi
+  _undeploy_app
 }
 
 @test "list without status" {
@@ -46,8 +43,6 @@ teardown(){
   assert_output --partial "$TEST_SERVER"
   assert_output --partial "$TEST_APP_DOMAIN"
   assert_output --partial "deployed"
-
-  _undeploy_app
 }
 
 @test "filter by server" {