Fix SPC h SPC, void smartparens-mode

Problem:
With the helm layer, `SPC h SPC` shows:
and: Symbol’s value as variable is void: smartparens-mode

Cause:
The `SPC h SPC` helm buffer generates a section called: Toggles
It checks the status of every toggle mode.

But smartparens-mode has the define-minor-mode :init-value nil

Solution:
Check that the two non-global smartparens modes are bound and true:
smartparens-mode
smartparens-strict-mode

Note:
The smartparens global (strict) mode toggles don't need to be checked,
because they enable smartparens-(strict-)mode.

layers/+spacemacs/spacemacs-editing/packages.el

@@ -415,7 +415,8 @@
       (add-hook 'minibuffer-setup-hook 'spacemacs//conditionally-enable-smartparens-mode)
       ;; toggles
       (spacemacs|add-toggle smartparens
-        :status (or smartparens-mode smartparens-strict-mode)
+        :status (or (bound-and-true-p smartparens-mode)
+                    (bound-and-true-p smartparens-strict-mode))
         :on (spacemacs//activate-smartparens)
         :off (spacemacs//deactivate-smartparens)
         :documentation "Enable smartparens."