roll_util: Escape 'Bug:' instead of filtering

Escape 'Bug:', 'Fixed:', and 'Fixes:' instead of filtering them out
completely.

Bug: b/243177456
Change-Id: I49521589b33e933ac682da7285059bf81be8d86e
Reviewed-on: https://pigweed-review.googlesource.com/c/infra/recipes/+/108673
Commit-Queue: Rob Mohr <mohrr@google.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 f20e7e1..46fdebd 100644
--- a/recipe_modules/roll_util/api.py
+++ b/recipe_modules/roll_util/api.py
@@ -24,6 +24,9 @@
 # If we're embedding the original commit message, prepend 'Original-' to lines
 # which begin with these tags.
 ESCAPE_TAGS = [
+    'Bug:',
+    'Fixed:',
+    'Fixes:',
     'Requires:',
     'Reviewed-on:',
 ]
@@ -33,17 +36,13 @@
 FILTER_TAGS = [
     'API-Review:',
     'Acked-by:',
-    'Auto-Submit',
     re.compile(r'^\w+-?Auto-Submit:', re.IGNORECASE),
-    'Bug:',
     'CC:',
     'CQ-Do-Not-Cancel-Tryjobs:',
     'Cq-Include-Trybots:',
     'Change-Id:',
     'Commit-Queue:',
     'Cq-Cl-Tag:',
-    'Fixed:',
-    'Fixes:',
     re.compile(r'Git[ -]?watcher:', re.IGNORECASE),
     'No-Docs-Update-Reason:',
     'No-Presubmit:',