Enable automatic inverse_of infering

It looks like we can't really benefit from this rule because usually we
need to specify the option anyway (maybe `user has_many :comments` is
one of the few exceptions). We might make some changes in the code when
Rubocop changes its Rails/InverseOf rule so it doesn't report this case
when using Rails 7, but, until then, we aren't changing anything so we
don't have to deal with false positives in Rubocop.

config/initializers/new_framework_defaults_7_0.rb

@@ -50,7 +50,7 @@ Rails.application.config.active_storage.video_preview_arguments =
   "-vf 'select=eq(n\\,0)+eq(key\\,1)+gt(scene\\,0.015),loop=loop=-1:size=2,trim=start_frame=1' -frames:v 1 -f image2"
 
 # Automatically infer `inverse_of` for associations with a scope.
-# Rails.application.config.active_record.automatic_scope_inversing = true
+Rails.application.config.active_record.automatic_scope_inversing = true
 
 # Raise when running tests if fixtures contained foreign key violations
 # Rails.application.config.active_record.verify_foreign_keys_for_fixtures = true