fix: getQuizzes from DB was corrupted

...essment/controller/service/AssessmentDBCommunication.java

...modules/assessment/controller/service/PeerAssessment.java

...es/assessment/controller/service/QuizDBCommunication.java

...tsdam/gf/modules/assessment/controller/view/QuizView.java

gemeinsamforschen/src/main/webapp/assets/js/Quiz.js

gemeinsamforschen/src/main/webapp/assets/js/createQuiz.js

...nsamforschen/src/main/webapp/assets/js/finalAssessment.js

gemeinsamforschen/src/main/webapp/assets/js/viewQuiz.js

gemeinsamforschen/src/main/webapp/pages/finalAssessments.jsp

gemeinsamforschen/src/scripts/dbschema/fltrail.sql