Improve timezone-select component

@@ -29,7 +29,7 @@
   </mat-form-field>
   <div *ngIf="alarmScheduleForm.get('type').value !== alarmScheduleType.ANY_TIME">
     <tb-timezone-select
-      [defaultTimezone]="defaultTimezone$ | async"
+      userTimezoneByDefault
       required
       formControlName="timezone">
     </tb-timezone-select>

@@ -40,7 +40,6 @@ import {
 import { isDefined, isDefinedAndNotNull } from '@core/utils';
 import { MatCheckboxChange } from '@angular/material/checkbox';
 import { getDefaultTimezone } from '@shared/models/time/time.models';
-import { share } from 'rxjs/operators';
 
 @Component({
   selector: 'tb-alarm-schedule',
@@ -62,10 +61,6 @@ export class AlarmScheduleComponent implements ControlValueAccessor, Validator,
 
   alarmScheduleForm: FormGroup;
 
-  defaultTimezone$ = getDefaultTimezone().pipe(
-    share()
-  );
-
   alarmScheduleTypes = Object.keys(AlarmScheduleType);
   alarmScheduleType = AlarmScheduleType;
   alarmScheduleTypeTranslate = AlarmScheduleTypeTranslationMap;