Always keep the compose box open after sending.

(Some cases are disabled on outside of staging still due to mix
protection concerns).

(imported from commit 26fcb95c055640ddd87c5df424990ebd865a336a)

zephyr/static/js/ui.js

@@ -1158,7 +1158,6 @@ $(function () {
     $('#user_presences').on('click', 'a', function (e) {
         var email = $(e.target).closest('a').attr('data-email');
         narrow.by('pm-with', email, {trigger: 'presence list'});
-        respond_to_sent_message = true;
         compose.start('private', {private_message_recipient: email,
                                   trigger: 'presence list'});
         // The preventDefault is necessary so that clicking the