Fix showing progress in solution mode

[otacke]

When merged in, the changes fix the outer right progress dot not bearing the answered state when switching to solution mode. See report at #71

[fnoks]

I believe this is more of a symptom fix. I.e: The issue is that the progress dot is not updated when xAPI answered is triggered. This is the reason:

h5p-question-set/js/questionset.js

Line 652 in dc560cc

if ($el.hasClass('current')) {

For me this seems like a bug - I don't see any reason why the current question's dot shouldn't be updated. Only removing this check won't work, though, since the aria label then won't include "current". For me it seems toggleAnsweredDot and toggleCurrentDot should be merged together.