Quizzes questions past #10 can now have answers added. ref 5191

Nested elements past the first ten end have a two digit code in their id,
and hence the regex that looks for their number had to select for multiple
digits. Specifically, a typo turned

.match(/\-\d+\-/)  // Selects multiple digits
into
.match(/\-\d\-/)   //Selects only one digit