Fix Unpermitted parameter error in log

[MorningLightMountain713]

Fixed the following error:

Sep  4 14:23:19 acstest bash: Started GET "/devices?page=2" for ::1 at 2017-09-04 14:23:19 +1200
Sep  4 14:23:19 acstest bash: Processing by DevicesController#index as HTML
Sep  4 14:23:19 acstest bash: Parameters: {"page"=>"2"}
Sep  4 14:23:19 acstest bash: Rendering devices/index.html.erb within layouts/application
Sep  4 14:23:19 acstest bash: Unpermitted parameter: page
Sep  4 14:23:19 acstest bash: Unpermitted parameter: page
Sep  4 14:23:19 acstest bash: Unpermitted parameter: page
Sep  4 14:23:19 acstest bash: Unpermitted parameter: page
Sep  4 14:23:19 acstest bash: Rendered application/_pagination.html.erb (6.5ms)
Sep  4 14:23:19 acstest bash: Unpermitted parameter: page
Sep  4 14:23:19 acstest bash: Rendered devices/index.html.erb within layouts/application (78.9ms)
Sep  4 14:23:19 acstest bash: Rendered layouts/_menu.html.erb (2.2ms)
Sep  4 14:23:19 acstest bash: Completed 200 OK in 148ms (Views: 126.0ms | ActiveRecord: 0.0ms)