Issue #2995570 by lauriii, jrockowitz, drpal, aaronbauman: #states breaks when OR is used

core/misc/states.es6.js

core/misc/states.js

core/modules/system/system.post_update.php

...ules/system/tests/modules/form_test/form_test.routing.yml

...tests/modules/form_test/src/Form/JavascriptStatesForm.php

core/tests/Drupal/Nightwatch/Tests/statesTest.js