Remove redundant #' before lambda in {mail,net,url}/*.el

Remove redundant #' before lambda in {mail,net,url}/*.el

* lisp/mail/mail-extr.el:
* lisp/mail/rmail.el (rmail-start-mail):
* lisp/net/gnutls.el (gnutls-boot-parameters):
* lisp/net/imap.el (imap-starttls-open):
* lisp/net/pop3.el (pop3-list):
* lisp/url/url-cookie.el (url-cookie-save-interval):
* lisp/url/url-history.el (url-history-save-interval)
(url-history-track):
* lisp/url/url-mailto.el (url-mailto): Remove redundant #' before lambda.