The checks were introduced in [22256] to prevent user settings to be set for super admins that were not a member of the current site. However the latter should apply to any kind of user, so the `is_super_admin()` check is redundant. Furthermore, removing these checks is necessary for the ongoing effort to get rid of `is_super_admin()` checks in general.
Props chandrapatel for initial patch.
Fixes#39199. See #37616.
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