MDL-62756 form: Remove any click handler first.

The handler has the old state variable. Remove any click handler first.

lib/amd/src/form-autocomplete.js

@@ -683,6 +683,8 @@ define(['jquery', 'core/log', 'core/str', 'core/templates', 'core/notification']
         }
 
         var suggestionsElement = $(document.getElementById(state.suggestionsId));
+        // Remove any click handler first.
+        suggestionsElement.parent().prop("onclick", null).off("click");
         suggestionsElement.parent().on('click', '[role=option]', function(e) {
             var pendingKey = 'form-autocomplete-parent';
             M.util.js_pending(pendingKey);