Disable Rails/ActionFilter cop

History in standard-rails:

- Disabled in initial rules import
- Enabled in bulk rails rule enable commit

This cop is both disabled by default and deprecated in rubocop-rails:
rubocop/rubocop-rails#1149

Rationale is that the cop is only relevant to Rails versions so early
they are no longer supported by rubocop-rails.

config/base.yml

@@ -37,7 +37,7 @@ Rails/ActionControllerTestCase:
   Enabled: false
 
 Rails/ActionFilter:
-  Enabled: true
+  Enabled: false
 
 Rails/ActionOrder:
   Enabled: false