Fix crash while trying to show a user's note

Caused by missing @Transactional

core/src/main/java/se/su/dsv/scipro/notes/NoteServiceImpl.java

@@ -1,6 +1,7 @@
 package se.su.dsv.scipro.notes;
 
 import com.querydsl.core.types.dsl.BooleanExpression;
+import jakarta.transaction.Transactional;
 import se.su.dsv.scipro.system.AbstractServiceImpl;
 import se.su.dsv.scipro.system.User;
 
@@ -20,6 +21,7 @@ public class NoteServiceImpl extends AbstractServiceImpl<Note, Long> implements
     }
 
     @Override
+    @Transactional
     public Note getNote(User user) {
         Note note = findOne(hasUser(user));
         if (note == null){