recipes.cfg: Remove bot_commit option.

Change-Id: Iaca829ed8af6d040bbd588aeb1ec9a021594d705
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2728130
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>
Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>

infra/config/recipes.cfg

@@ -7,7 +7,6 @@
     },
     "trivial": {
       "automatic_commit": true,
-      "bot_commit": true,
       "tbr_emails": [
         "iannucci@chromium.org"
       ]