chore: prefer named exports (#8315)

* chore: prefer named exports

* chore: fix import

src/calendar/test/index.legacy.js

@@ -1,4 +1,4 @@
-import Calendar from '..';
+import { Calendar } from '..';
 import { mount, later } from '../../../test';
 import { getNextDay } from '../utils';
 import {

src/calendar/test/index.spec.js

@@ -1,4 +1,4 @@
-import Calendar from '..';
+import { Calendar } from '..';
 import { mount } from '../../../test';
 import { getNextDay, getPrevDay } from '../utils';
 import { minDate, maxDate } from './utils';

src/calendar/test/prop.legacy.js

@@ -1,4 +1,4 @@
-import Calendar from '..';
+import { Calendar } from '..';
 import { mount, later } from '../../../test';
 import { minDate, maxDate, formatRange, formatDate } from './utils';