[3.0] Misc fixes for SMF\User

[Sesquipedalian]

1. Applies bans and warnings correctly in SMF\User::kickIfBanned()
   • Referred to an object property that doesn't exist rather than the property that does.
2. Fixes bug checking spoofed names in User::isReservedName()
   • Fixes an incorrect variable name.
3. Fixes queries in SMF\Tasks\AnonymizeEditHistory::execute()
   • Fixes incorrect argument order when passing arguments to Db::$db->query().
4. Respects custom themes' membergroup icons in SMF\User::format()
   • Previously, custom themes' membergroup icons would be overwritten by the default theme's.
5. Correctly updates loaded objects in SMF\User::updateMemberData()
   • Previously passed [$var, $val] to set() method, but should have passed [$var => $val].
6. Fixes type of SMF\User::$time_offset
   • Float, not int.
7. Preserves buddy list in User properties even if feature is disabled
   • Previously, this data was handled inconsistently and could be permanently lost if the related feature was disabled.
8. Preserve ignored boards in User properties even if feature is disabled
   • Previously, this data was handled inconsistently and could be permanently lost if the related feature was disabled.