Automatically scroll to first unread message

#### Is your feature request related to a problem? Please describe.
This is the only messaging app I have used that when opening an unread chat, starts at the bottom (last messages) instead of at the first unread message. This is unintuitive for me and my friends, because it's an extra step to read the messages in chronological order.

#### Describe the solution you'd like.
Have Element always scroll to (or start at) the first message when opening an unread chat and get rid of the "go to first unread massage" banner. In order to scroll to the last message the arrow at the bottom right can be used, which is how most other apps do it.

#### Describe alternatives you've considered.
None

#### Additional context
I'm not sure how Element Web/Desktop does it. If it's the same way, I haven't been as annoyed by it as on Android, probably because the screen is bigger.