Remove all inline event handlers

This allows blueslip to catch exceptions from the event handlers on
these elements in addition to the other benefits that not using
inline handlers provide.

(imported from commit 2bdcb2496c6c08fa7228a20ce6164b527cf64e41)

zephyr/static/js/zephyr.js

@@ -1033,7 +1033,3 @@ function fast_forward_pointer(btn) {
         }
     });
 }
-
-function logout() {
-    $('#logout_form').submit();
-}