Reaction preview bug

### Description
When a reaction arrives in DM room to my message, it's prefixed with the contact's name...

and when the page is reloaded it's without name prefix...

Feature `feature_roomlist_preview_reactions_dms` is enabled via config file.

I would appreciate format of message preview like:
`👍 to message "I like it"`

and notification counter increased in DMs.

### Steps to reproduce

- Send a message to someone in DM
- Someone gives a reaction to that message
- Reaction preview is preffixed with somebody's name
- Reload Element Web page
- Reaction preview is not preffixed with somebody's name

### Version information

- **Platform**: Element Web

For the web app:

- **Browser**: Firefox 88b3
- **OS**: Windows 10
- **URL**: private server with Element Web 1.24 rc1