[Rooms list] Do not suggest collapse the unique section

### Your use case

#### What would you like to do?
In the rooms list, the sections are collapsable

This is ok when there are severals section, but irrelevant when there is only one section.
I suggest here disabling and hiding the option when there is only one section (this is the case for example when I don't have pending invites and when I didn't taf room (favorite/low priority))
When we select a space the case where there is only one section is more frequent

### Have you considered any alternatives?

_No response_

### Additional context

_No response_