Run recipes.py with --timestamps

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2330123002

Review-Url: https://codereview.chromium.org/2330123002
diff --git a/infra/bots/swarm_recipe.isolate b/infra/bots/swarm_recipe.isolate
index 8a6803f..9e8f516 100644
--- a/infra/bots/swarm_recipe.isolate
+++ b/infra/bots/swarm_recipe.isolate
@@ -4,7 +4,7 @@
   ],
   'variables': {
     'command': [
-      'python', 'recipes.py', 'run',
+      'python', 'recipes.py', 'run', '--timestamps',
     ],
     'files': [
       '../config/recipes.cfg',