Can't use ico or webp for avatars

[](https://www.bountysource.com/issues/43754045-can-t-use-ico-for-room-avatar)

### Description

When using an *.ico file, like [this one](http://vps1.t2l.io/Martz90-Hex-Warning.ico), Riot tries the upload, considers it successful, and update the local avatar to match the new file. Once the settings pane is dismissed, the icon reverts to whatever it was before.

### Steps to reproduce

- Change room avatar to *.ico file

I would have expected Riot to tell me it was an unsupported file type, or the icon change to work.

Log: not sent

After uploading image:

After closing settings pane:

### Version information

- **Platform**: web (in-browser)
- **Browser**: Chrome 56
- **OS**: Windows 10
- **URL**: riot.im/develop