fix: DB communication for assessments

...in/java/unipotsdam/gf/core/management/ManagementImpl.java

...rc/main/java/unipotsdam/gf/core/management/user/Menu.java

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

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

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

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

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

...nsamforschen/src/main/webapp/assets/js/overview-docent.js

gemeinsamforschen/src/main/webapp/pages/Quiz-docent.jsp

gemeinsamforschen/src/main/webapp/pages/overview-docent.jsp

gemeinsamforschen/src/main/webapp/pages/project-docent.jsp

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