Update condition for the info box: "Your class selections have changed. Refreshing your schedules..."

The info box for "Your class selections have changed. Refreshing your schedules..." currently checks the **length** of classSections and doesn't even consider customEvents. The condition should watch the Vuex state instead, like SelectedEvents.vue.

```js
//PaginatedSchedule
selectedClassSectionsHaveUpdated: function() {
if (this.lastUsedClassSections.length == 0) { // For when the component is first created
return false;
} else {
// (big) TODO: This should also check the contents, not just the length. Also it's not checking custom events.
return this.lastUsedClassSections.length != this.classSections.length;
}
},
```

```js
// SelectedEvents
watch: {
selectedCoursesAndCustomEvents: function() {
this.throttledGetSchedules();
}
},
computed: {
selectedCoursesAndCustomEvents: function() {
return this.$store.state.selectedCustomEvents.concat(this.$store.state.selectedCourses);
}
}
```

Start in the PaginatedSchedule component at selectedClassSectionsHaveUpdated, then compare its state handling with SelectedEvents.vue and selectedCoursesAndCustomEvents. Verify that the info box responds to changes in both selected courses and custom events, including changes to the selections themselves rather than only their count.

Written by the indexing model from the issue text.