Removing the UseTaskFriendlySynchronizationContext key on uninstall breaks other modules

Removing the `aspnet:UseTaskFriendlySynchronizationContext` key from the `web.config` on module uninstall breaks other modules installed on my DNN site that require the use of the key.

Can we just add the key on install if it's not already present in the `web.config` and then not remove it on uninstall. As there's no way to tell if it was already present / if anything else uses the key.