Prefaced fields with “users” for clarity

[snipe]

Saw this pop up in a Rollbar - this just clarifies the users table as the one we want to be sorting against in the left join in scopeUserLocation() to avoid ambiguity.

[what-the-diff]

PR Summary

• Improved User Location Search
  The method used for locating users based on specific parameters has been enhanced. This change ensures a more precise search, particularly in cases with complex search criteria. This was achieved by updating the references to column names to be more explicit, thus minimizing any potential for confusion or error in the system during searches.