fix smartparens-mode inserts double ' in minibuffer

smartparens-mode is sometimes activated in the minibuffer by
spacemacs//conditionally-enable-smartparens-mode, specifically if we are in the
minibuffer due to eval-expression (or eldoc-eval-expression). This is convenient
for things like parens, but we don't want this behavior on a single quote. It
looks like we *tried* to stop this, but for whatever reason that configuration
was for minibuffer-inactive-mode rather than minibuffer-mode. The former is the
major mode of the minibuffer when it is *not* active, whereas the latter is the
major mode of the minibuffer when it *is* active. This has been part of
spacemacs for a long time, so I've simply added configuration for
minibuffer-mode and left behind the configuration for minibuffer-inactive-mode
in case somebody was relying on that

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

@@ -444,6 +444,7 @@
  (show-smartparens-global-mode +1)
  ;; don't create a pair with single quote in minibuffer
  (sp-local-pair 'minibuffer-inactive-mode "'" nil :actions nil)
+ (sp-local-pair 'minibuffer-mode "'" nil :actions nil)
  (sp-pair "{" nil :post-handlers
  '(:add (spacemacs/smartparens-pair-newline-and-indent "RET")))
  (sp-pair "[" nil :post-handlers