Fix `Lint/OrAssignmentToConstant` cop (#27750)

.rubocop_todo.yml

@@ -24,11 +24,6 @@ Lint/NonLocalExitFromIterator:
   Exclude:
     - 'app/helpers/jsonld_helper.rb'
 
-# This cop supports unsafe autocorrection (--autocorrect-all).
-Lint/OrAssignmentToConstant:
-  Exclude:
-    - 'lib/sanitize_ext/sanitize_config.rb'
-
 # This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: IgnoreEmptyBlocks, AllowUnusedKeywordArguments.
 Lint/UnusedBlockArgument:

lib/sanitize_ext/sanitize_config.rb

@@ -64,7 +64,7 @@ class Sanitize
       current_node.wrap('<p></p>')
     end
 
-    MASTODON_STRICT ||= freeze_config(
+    MASTODON_STRICT = freeze_config(
       elements: %w(p br span a del pre blockquote code b strong u i em ul ol li),
 
       attributes: {
@@ -91,7 +91,7 @@ class Sanitize
       ]
     )
 
-    MASTODON_OEMBED ||= freeze_config(
+    MASTODON_OEMBED = freeze_config(
       elements: %w(audio embed iframe source video),
 
       attributes: {