Fix Lint/DuplicateBranch cop (#24766)

lib/mastodon/maintenance_cli.rb

@@ -664,9 +664,7 @@ module Mastodon
 
     def remove_index_if_exists!(table, name)
       ActiveRecord::Base.connection.remove_index(table, name: name)
-    rescue ArgumentError
-      nil
-    rescue ActiveRecord::StatementInvalid
+    rescue ArgumentError, ActiveRecord::StatementInvalid
       nil
     end
   end