read/write ui.json

repertory/repertory/src/ui/mgmt_app_config.cpp

@@ -109,5 +109,6 @@ void mgmt_app_config::set_mount_location(provider_type prov,
                                          std::string_view location) {
   recur_mutex_lock lock(mtx_);
   locations_[prov][std::string{name}] = std::string{location};
+  save();
 }
 } // namespace repertory::ui