Help dialog; fix show-advanced-command button position.
Help dialog; fix show-advanced-command button position.

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