SL-18911 My Land Holdings floater crashes viewer on the Xcode/+Monterey branches (#47)

Revert part of "DRTVWR-575: Address review comments on Xcode 14.1 type tweaks."
Crash was reproduced when assigning areastr to llsd, but likely present in other cases of assigning ui strings to llsd (instead of going for lluistring's result directly copy constructor was engaged and either copy or original crashed due to invalid pointers, copy shouldn't have been created).