Keep Persistent Notifications After Reboot

**Is your feature request related to a problem? Please describe.**

Hello! Just noticed that after rebooting my device, persistent notifications from the companion app weren't restored. Non persistent ones were restored.
The problem is that most of the time I use persistent notifications is to be reminded of something important. So if I need to reboot my device or if the battery dies, I lose my persistent notifications.

**Describe the solution you'd like**

I'd like the persistent notifications to be restored as the non persistent notifications are.
For me, it feels that I may lose important notifications when I use persistent notifications (the idea is supposed to be the opposite, right?).

**Describe alternatives you've considered, if any**

**Additional context**

One simple example is:

I get a persistent notification to put the clothes in the dryer when my washing machine is done.

service: notify.mobile_app_myphone
data:
message: Take the clothes out of it as soon as possible!
title: Washer is done
data:
persistent: true
tag: persistent
sticky: true

So if I'm busy or not at home when the washer is done and my battery dies or I reboot the phone, the persistent notification won't be restored and I may forget to put the clothes inside the dryer.