Correct a longstanding typo in DOM tests
Correct a longstanding typo in DOM tests

philc/vimium,decaffeinate-examples/vimium,mrmr1993/vimium,decaffeinate-examples/vimium,gdh1995/vimium,smblott-github/vimium,gdh1995/vimium,mrmr1993/vimium,smblott-github/vimium,poacher2k/vimium,poacher2k/vimium,gdh1995/vimium,philc/vimium,decaffeinate-examples/vimium,mrmr1993/vimium,poacher2k/vimium,philc/vimium,smblott-github/vimium