web: Fix login form canceling when pressing enter

Signed-off-by: Eduardo L. Buratti <elb09@c3sl.ufpr.br>

web/app/partials/login.html

@@ -18,7 +18,7 @@
                     </div>
                 </div>
                 <div class="modal-footer">
-                    <button class="btn btn-default" ng-click="login.cancel()">Cancelar</button>
+                    <button type="button" class="btn btn-default" ng-click="login.cancel()">Cancelar</button>
                     <button type="submit" class="btn btn-primary">
                         Login <i class="saving" ng-show="login.loading"></i>
                     </button>