Room creators should not have text box to set power level in profile sidebar

### Steps to reproduce

1. Create a new (v12) room.
2. Open the profile sidebar.
3. Open your profile in the sidebar.

### Outcome

#### What did you expect?

Per [spec](https://spec.matrix.org/v1.16/rooms/v12/#event-format), room creators "have infinitely high power level and cannot be specified in the `m.room.power_levels` event".

Thus, there should not be an option to set a power level for a creator. (It may be desirable to add a text note designating the account as a creator, in place of the text box?)

#### What happened instead?

There is a "power level" text box, to set a power level for that user.

Trying to actually set a power level using this text box produces "Error: Failed to change power level".

### Operating system

_No response_

### Browser information

_No response_

### URL for webapp

staging.element.io

### Application version

Element version: 1.12.0

### Homeserver

_No response_

### Will you send logs?

No