misc/ruby-electric.el: Avoid electric insertion in some cases.

* misc/ruby-electric.el (ruby-electric-curlies)
  (ruby-electric-matching-char, ruby-electric-bar): Avoid electric
  insertion when there is a prefix argument.

* misc/ruby-electric.el (ruby-electric-insert)
  (ruby-electric-cua-replace-region-p)
  (ruby-electric-cua-replace-region): Avoid electric insertion and
  fall back when cua-mode is enabled and a region is active.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39419 b2dd03c8-39d4-4d8f-98ff-823fe69b080e