Check for false in proc

In rails/rails@394b7be parameters set were changed to query strings to
behave more like a real browser. In a browser the parameters `false`
will never get sent as `false` and will always be `"false"`. Because
of this change the test for passing `false` into this `Proc` was
failing. We need to change it to check if the layout is not false rather
than relying on the value in the parameters.

Author: eileencodes

test/caching_test.rb

@@ -41,7 +41,7 @@ class ActionCachingTestController < CachingController
   caches_action :with_symbol_format, cache_path: 'http://test.host/action_caching_test/with_symbol_format'
   caches_action :not_url_cache_path, cache_path: Proc.new { |c| "#{c.params[:action]}_key" }
   caches_action :layout_false, layout: false
-  caches_action :with_layout_proc_param, layout: Proc.new { |c| c.params[:layout] }
+  caches_action :with_layout_proc_param, layout: Proc.new { |c| c.params[:layout] != "false" }
   caches_action :record_not_found, :four_oh_four, :simple_runtime_error
   caches_action :streaming
   caches_action :invalid