Pomodoro will reset after a refresh, which should not happen

[theSaLi]

• what is this feature about?
  Pomodoro will reset after a refresh on the page or after switching the view and coming back to Pomodoro, which should not happen. componentUnmount is probably related to the reset after refreshing.

• potential affected files?
  frontend\src\components\pomodoroview\PomodoroView.jsx

• are there some depending RP that is not approved yet?
  no