Remove MSC3244 use from restricted room creation

[mjarr]

Description

Replaces preferred room version checking from rejected MSC3244 with in-client checks for restricted room creation. It also no longer hardcodes restricted rooms to room version 9.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

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[ajbura]

Looks good 👍 . Thanks!