roll_util: Drop ".*-Readability-Trivial" footers

Drop footers ending with "-Readability-Trivial" when rolling CLs.

Bug: b/240290899
Change-Id: I95af867c3d697821ab0e4f84915bb9dfbd3d72e8
Reviewed-on: https://pigweed-review.googlesource.com/c/infra/recipes/+/121470
Pigweed-Auto-Submit: Rob Mohr <mohrr@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
Reviewed-by: Ted Pudlik <tpudlik@google.com>
diff --git a/recipe_modules/roll_util/api.py b/recipe_modules/roll_util/api.py
index e20b7ea..cdb309d 100644
--- a/recipe_modules/roll_util/api.py
+++ b/recipe_modules/roll_util/api.py
@@ -49,6 +49,7 @@
     'No-Presubmit:',
     'No-Tree-Checks: true',
     'No-Try: true',
+    re.compile(r'^\w+-?Readability-Trivial:', re.IGNORECASE),
     'Reviewed-by:',
     'Roller-URL:',
     'Signed-off-by:',