Change room keyboard shortcut clashes with select text forward keyboard shortcut

### Steps to reproduce

1. Go in a room, start writing some text in the composer over two lines
2. Select a bit of that text
3. Use the keyboard combo OPTION+SHIFT+DOWN ARROW

### What happened?

It switched me to the next room on the room list as this is the behaviour for the OPTION+DOWN ARROW shortcut

### What did you expect?

For the OS native SHIFT+OPTION+DOWN ARROW shortcut to work (it selects all the remaining text forward in a text area, over multiple lines)

### Operating system

macOs

### Browser information

Chrome

### URL for webapp

app.element.io

### Have you submitted a rageshake?

No