chore: prettier source code

src/calendar/components/Header.js

@@ -30,7 +30,7 @@ export default createComponent({
 
       return (
         <div class={bem('weekdays')}>
-          {weekdays.map(item => (
+          {weekdays.map((item) => (
             <span class={bem('weekday')}>{item}</span>
           ))}
         </div>

src/calendar/components/Month.js

@@ -99,8 +99,8 @@ export default createComponent({
     },
 
     getMultipleDayType(day) {
-      const isSelected = date =>
-        this.currentDate.some(item => compareDay(item, date) === 0);
+      const isSelected = (date) =>
+        this.currentDate.some((item) => compareDay(item, date) === 0);
 
       if (isSelected(day)) {
         const prevDay = getPrevDay(day);