Room level notification issue

### Steps to reproduce

@room feature is currently working in web version, when i try to check the same in android app its not working.
If we tried to post a message to all participants in room by keeping @room annotation in text box (@room flyover window - is not showing then it should notify to all users in a particular room.

See the below image for reference , @room tag just posted as plain message without any tagging like user.


### Intended result and actual result

#### What did you expect?
By typing @room text in text box it should show a flyover window just like when we type for user and @room should be able to select from it and send a notification to all users after it sends a message in particular room.
#### What happened instead?
It just pass as a plain text instead of notify all users saying got a new message.

### Your phone model

Samsung S8

### Operating system version

Android 9

### Application version and app store

1.3.1

### Homeserver

_No response_

### Have you submitted a rageshake?

No