Fix widget permission

[p1gp1g]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

The Widget API was not correctly injected to allowed widgets.

Motivation and context

This fixes #3892 .
It can be considered has a partial fix for this issue since widget can't send stickers at this moment, but this is a different issue. [Edit: widgets are now able to send stickers, with the ActivityResultLauncher]

The changes are needed to use https://github.com/torinreilly/matrix-gif-keyboard and/or https://github.com/maunium/stickerpicker (and very probably others) as a widget.

Tests

• On element-web/desktop : /addwidget https://maunium.net/stickers-demo/
• Try to access it on element-android

Tested devices

• Physical
• Emulator
• OS version(s): 9

Checklist

• Changes has been tested on an Android device or Android emulator with API 21
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/vector-im/element-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-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
• If you have modified the screen flow, or added new screens to the application, you have updated the test UiAllScreensSanityTest.allScreensTest()

[bmarty]

(Closed and reopened to wake up the CI)

[bmarty]

This looks like a decent PR to merge. Just trying to wake the CI again.

[p1gp1g]

Rebased + Linted

[p1gp1g]

The last commit may be separated to a new PR but these changes fix the related issues

[p1gp1g]

@bmarty I don't know if I should have highlighted you to ask a new review so I'm doing it now. Sorry for the noise if I shouldn't have.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}