Room notifications setting custom sound its save button shows a user no indication of success

### Steps to reproduce

1. In a room its notifications settings
2. A user selects a custom sound through the browse button
3. The user presses the save button

### Outcome

#### What did you expect?
- The "Notification sound:" changed from value "default" to the new sound saved.
- The save button becomes disabled again on successful upload.

#### What happened instead?
- The "Notification sound:" still shows "default" as value after the upload of a custom sound succeeded.
- The Save button remains enabled and can be pressed indefinitely to trigger an upload request.

### Operating system

_No response_

### Browser information

_No response_

### URL for webapp

_No response_

### Application version

_No response_

### Homeserver

_No response_

### Will you send logs?

No