If student visit TA lab then don't allow student's to select a room

src/main/java/nl/tudelft/ewi/queue/DatabaseLoader.java

...n/java/nl/tudelft/ewi/queue/controller/LabController.java

src/main/java/nl/tudelft/ewi/queue/model/Lab.java

src/main/java/nl/tudelft/ewi/queue/model/Request.java

.../java/nl/tudelft/ewi/queue/repository/RoomRepository.java

src/main/resources/templates/lab/enqueue.html

src/main/resources/templates/lab/view.html