Enable webrtc debug mode

Type of change

Debug mode in webrtc is enabled

[ ] 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/tchapgouv/tchap-android/blob/develop/CONTRIBUTING.md#accessibility
[x] Pull request is based on the develop branch
[x] Pull request includes a new file under ./changelog.d. See https://github.com/tchapgouv/tchap-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()