When a log name is generated, update the $log object so that the new name is available downstream

Problem/Motivation

The function log_name_generate() generates a name for the log based on token replacements. Currently, it updates the log's name directly in the database. But if the log entity has been loaded elsewhere in the code, it may still be using the cached version, which has the old name.

Proposed resolution

In log_name_generate(), also update the name on the $log object that is passed in. This will make that name available to downstream code.