Add a "-q" to the link id for the quiz.

During lessons and the quiz the HTML contains the old html from the
learning part. This means that the show/hide links also exists in the
HTML so the links in the quiz needs a separate id from the links in the
non-quiz to prevent id collisions.
Set correct selector for waitForKeyElements in quiz mode
item-info-meaning-mnemonic doesn't exist for radicals, but note-meaning
does exist for radical, kanji and vocabulary.