Always register the pusher when application starts

[bmarty]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

Always register the pusher when application starts, in case the pusher get deleted on the server for some reason...
Also checked: when notification are disabled from the internal settings, the pusher is not unregistered. So there is no risk to enable notification again by registering again the pusher.

Motivation and context

Fix #1481

Screenshots / GIFs

Tests

• Step 1
• Step 2
• Step ...

Tested devices

• Physical
• Emulator
• OS version(s):

Checklist

• Changes have been tested on an Android device or Android emulator with API 23
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/vector-im/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request includes a new file under ./changelog.d. See https://github.com/vector-im/element-x-android/blob/develop/CONTRIBUTING.md#changelog
• Pull request includes screenshots or videos if containing UI changes
• Pull request includes a sign off
• You've made a self review of your PR

[sonarcloud]

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