fix fail rolling restart task

[idekeita]

After upgrading from 0.20.0 to 1.0.0, The following errors occured

ArgumentError: wrong number of arguments (given 1, expected 0)
capistrano-sidekiq-1.0.0/lib/capistrano/tasks/sidekiq.rake:134:in `each_process_with_index'
capistrano-sidekiq-1.0.0/lib/capistrano/tasks/sidekiq.rake:94:in `block (4 levels) in <top (required)>'
capistrano-sidekiq-1.0.0/lib/capistrano/tasks/sidekiq.rake:206:in `switch_user'
capistrano-sidekiq-1.0.0/lib/capistrano/tasks/sidekiq.rake:91:in `block (3 levels) in <top (required)>'

The cause is that the argument has changed
https://github.com/seuros/capistrano-sidekiq/blob/v0.20.0/lib/capistrano/tasks/sidekiq.rake#L32
https://github.com/seuros/capistrano-sidekiq/blob/v1.0.0/lib/capistrano/tasks/sidekiq.rake#L132

[seuros]

Thank you