fix(DatePicker): set hour on 24h mode on date select, fixes primeface…

…s#5596

This commit is a copy of PR primefaces#5607 for the v4 branch. Since the component was renamed, the fix from the master branch was not applied to the new component.

components/lib/datepicker/DatePicker.vue

@@ -1168,9 +1168,9 @@ export default {
             let date = new Date(dateMeta.year, dateMeta.month, dateMeta.day);
 
             if (this.showTime) {
-                if (this.hourFormat === '12' && this.currentHour !== 12) {
-                    this.pm ? date.setHours(this.currentHour + 12) : date.setHours(this.currentHour);
-                }
+                (this.hourFormat === '12' && this.currentHour !== 12 && this.pm) ? 
+                    date.setHours(this.currentHour + 12) : 
+                    date.setHours(this.currentHour);
 
                 date.setMinutes(this.currentMinute);
                 date.setSeconds(this.currentSecond);