Remove ShortURL (non-)optional feature

## Description of task
Forums module has a module setting for SHORTURLS that is not settable from the UI but is always enabled. This setting is evaluated every time a topic url is generated and adds unnecessary complexity (it's used dozens of places) and questionable value. While the shorter url (a topic as a query parameter but without the corresponding forum / forum group parameters as context) perhaps makes the page smaller, it duplicates many URLs that a crawler sees and potentially erodes SEO.

Proposing to remove this option and always generating consistent longer contextual URLs.

Incoming shorter URLs would continue to work but might add 301 redirects to the longer URLs?

## What general area(s)/component(s) are affected?
** check any / all **
[] User interface
[] Database schema
[X] Business Logic
[] Dependencies
[] Installation/manifest

## Additional context
Add any other context or screenshots about the task here.