Removes unused parameter in nav_links

This change removes an unused parameter in the nav links function
that renders "active" navigation links.

app/helpers/tab_helper.rb

@@ -73,7 +73,6 @@ module TabHelper
   #           :action       - One or more action names to check (optional).
   #           :path         - A shorthand path, such as 'dashboard#index', to check (optional).
   #           :html_options - Extra options to be passed to the list element (optional).
-  #           :unless       - Callable object to skip rendering the 'active' class on `li` element (optional).
   # block   - An optional block that will become the contents of the returned
   #           `li` element.
   #
@@ -118,11 +117,6 @@ module TabHelper
   #   nav_link(path: 'admin/appearances#show') { "Hello"}
   #   # => '<li class="active">Hello</li>'
   #
-  #   # Shorthand path + unless
-  #   # Add `active` class when TreeController is requested, except the `index` action.
-  #   nav_link(controller: 'tree', unless: -> { action_name?('index') }) { "Hello" }
-  #   # => '<li class="active">Hello</li>'
-  #
   #   # When `TreeController#index` is requested
   #   # => '<li>Hello</li>'
   #
@@ -151,8 +145,6 @@ module TabHelper
   end
 
   def active_nav_link?(options)
-    return false if options[:unless]&.call
-
     controller = options.delete(:controller)
     action = options.delete(:action)