Also sort by due date by default

to comply with Tasks v0.9.8 and older

src/components/SortorderDropdown.vue

@@ -70,7 +70,7 @@ export default {
 					id: 'default',
 					icon: 'icon-list',
 					text: t('tasks', 'Default'),
-					hint: t('tasks', 'Sort by completed state, priority, start date and summary.')
+					hint: t('tasks', 'Sort by completed state, due date, priority, start date and summary.')
 				},
 				{
 					id: 'due',

src/store/storeHelper.js

@@ -153,7 +153,7 @@ function sort(tasks, sortOrder, sortDirection) {
 		break
 	}
 	default:
-		comparators = [sortByCompleted, sortByPriority, sortByStart, sortAlphabetically]
+		comparators = [sortByCompleted, sortByDue, sortByPriority, sortByStart, sortAlphabetically]
 	}
 	var sortedTasks = tasks.sort((taskA, taskB) => {
 		var compIndex = 0