"Show Message bubbles" should be on by default

### Your use case

#### What would you like to do?
Show Message bubbles (Settings -> Preferences, under Timeline) should be on by default
#### Why would you like to do it?
On a mobile devices, people are used to message bubbles (some apps that use it by default: whatsapp, facebook messenger, signal, the default messaging app on android).
I changed this settings for some people (particularly older people) and reactions were either very positive or neutral.

### Have you considered any alternatives?

People who prefer message bubbles probably won't be playing with the settings to find this option so this could be solved with some kind of quick setup on first download.

### Additional context

I assume the same is true for the ios (although no one I know uses it)

### Are you willing to provide a PR?

No