New lines in input field are not rendered

## Steps to reproduce

* Write something with new lines, like that:
```
Test1
Test2
Test3
```
* Hit Enter

## Actual behavior

The new lines are replaced with spaces, like this:
```
Test1 Test2 Test3
```

## Expected behavior

The same behavior as in Riot Web/Desktop is expected, i.e. a new line in the text input should still be a new line once rendered, like this:
```
Test1
Test2
Test3
```

## Information

RiotX: 0.13.0 [40013002] (G-b1621)
Matrix SDK: 0.0.1 (f471d9cf)
OLM: 3.1.2