`:excluded` doesn't work through `configuration-layer/declare-layer`.

[darkfeline]

Description

:excluded doesn't work through configuration-layer/declare-layer.

Reproduction guide

• Make a layer foo that contains (configuration-layer/declare-layer bar) in config.el.
• Make a layer bar that contains (setq bar-packages '((org-bullets :excluded t))) in packages.el.
• Start Emacs

Observed behaviour:

• org-bullets gets installed.

Expected behaviour:

• org-bullets gets excluded.

  System Info

• OS: gnu/linux
• Emacs: 24.5.1
• Spacemacs: 0.105.20
• Spacemacs branch: develop (rev. 73d4833)
• Graphic display: t
• Distribution: spacemacs
• Editing style: vim
• Completion: ivy
• Layers:

(spacemacs-ivy spacemacs-layouts
               (auto-completion :variables auto-completion-enable-sort-by-usage t)
               better-defaults gtags ibuffer spell-checking syntax-checking semantic typography
               (chrome :variables edit-server-new-frame nil)
               dash elfeed
               (shell :variables shell-default-shell 'eshell shell-default-term-shell
                      (mir/with-executable "/usr/local/bin/fish" "/usr/bin/fish" "/bin/bash" "/bin/sh")
                      shell-default-height 50)
               prodigy restclient version-control git c-c   common-lisp csv dockerfile go html javascript latex lua markdown python ruby shell-scripts sql yaml django mir-magit-annex mir-pass mir-rc mir-rc-qualia mir-rc-mail)

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