[Fix Issue 15683] `readonly` input should not have a not-allowed cursor
[Fix Issue 15683] `readonly` input should not have a not-allowed cursor

BS3 commits: a7a6e7f8d6c4900b83017f7ae2bd69ec509d32c4

mozillo/todc-bootstrap,aaroncnhk/todc-bootstrap,todc/todc-bootstrap,2947721120/googlebt4,up2vs/todc-bootstrap,ztx1491/todc-bootstrap,2947721120/todc-bootstrap,todc/todc-bootstrap,todc/todc-bootstrap