Do not trigger currentDate if last day is visible

It does not have to be the currentDate. This holds only for the first day.

aleksis/apps/alsijil/frontend/components/coursebook/Coursebook.vue

@@ -259,9 +259,7 @@ export default {
         if (entry.isIntersecting) {
 
           // TODO: Make 165 a var?
-          if ((entry.boundingClientRect.top <= 165)
-              || first
-              || last) {
+          if ((entry.boundingClientRect.top <= 165) || first) {
             console.log('@', date.toISODate());
             this.setDate(date.toISODate());
           }