Fix Cask::Cask.all bug

We were only loading casks from files with this command which,
of course, didn't work for casks that can only be loaded from
the API (when the core cask tap is not tapped). This changes
things to align more with what we do for formulae.

Library/Homebrew/cask/cask.rb

@@ -30,8 +30,11 @@ module Cask
         raise ArgumentError, "Cask::Cask#all cannot be used without --eval-all or HOMEBREW_EVAL_ALL"
       end
 
-      Tap.flat_map(&:cask_files).map do |f|
-        CaskLoader::FromTapPathLoader.new(f).load(config: nil)
+      # Load core casks from tokens so they load from the API when the core cask is not tapped.
+      tokens_and_files = CoreCaskTap.instance.cask_tokens
+      tokens_and_files += Tap.reject(&:core_cask_tap?).flat_map(&:cask_files)
+      tokens_and_files.map do |token_or_file|
+        CaskLoader.load(token_or_file)
       rescue CaskUnreadableError => e
         opoo e.message