[web] Replace threadHasPermission with useThreadHasPermission in ThreadSettings*

Summary:
Similar to D11752, but for ThreadSettingsGeneralTab and ThreadSettingsModal

Depends on D11752

Test Plan:
flow + close reading.

Will test generally at end to make sure things work as expected. Don't think it's practical to manually test each of these trivial changes.

Reviewers: ginsu, varun, will, ashoat

Reviewed By: ashoat

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D11753