Fix misuse of quote in `case'.

Fix misuse of quote in `case'.
* lisp/progmodes/ruby-mode.el (ruby-backward-sexp):
* lisp/progmodes/ebrowse.el (ebrowse-draw-file-member-info):
* lisp/play/gamegrid.el (gamegrid-make-face):
* lisp/play/bubbles.el (bubbles--grid-width, bubbles--grid-height)
(bubbles--colors, bubbles--shift-mode, bubbles--initialize-images):
* lisp/notifications.el (notifications-notify):
* lisp/net/xesam.el (xesam-search-engines):
* lisp/net/quickurl.el (quickurl-list-insert):
* lisp/vc/vc-hg.el (vc-hg-dir-printer): Fix use of case.
* lisp/gnus/auth-source.el (auth-source-netrc-create):
* lisp/gnus/message.el (message-yank-original): Fix use of `case'.
* lisp/org/org-src.el (org-src-switch-to-buffer):
* lisp/org/org-plot.el (org-plot/gnuplot-script, org-plot/gnuplot):
* lisp/org/org-mouse.el (org-mouse-agenda-type):
* lisp/org/org-freemind.el (org-freemind-node-to-org):
* lisp/org/ob-sql.el (org-babel-execute:sql):
* lisp/org/ob-exp.el (org-babel-exp-do-export, org-babel-exp-code):
* lisp/org/ob-ref.el (org-babel-ref-resolve): Fix use of case.