♻️ Remove useless sorting of substitutions

src/store.js

@@ -56,7 +56,7 @@ export const substitutionsForDate = computed(() => {
     if (!dates[date]) dates[date] = [];
     dates[substitution.date].push(substitution);
   }
-  return sortObject(dates);
+  return dates;
 });
 
 export const parsedTimetable = computed(() => {
@@ -159,12 +159,3 @@ export async function fetchHistory() {
 }
 
 fetchData();
-
-function sortObject(obj) {
-  return Object.keys(obj)
-    .sort()
-    .reduce(function (result, key) {
-      result[key] = obj[key];
-      return result;
-    }, {});
-}