config.txt not being updated in Bookworm

[imaplt]

This is related to the previous issue I reported. In Bookworm, the config.txt file has been moved to the firmware directory under boot. Because there is a config.txt placeholder file in the boot directory the SPC code edits this file. There are several solutions but is seems the easiest is to change the order of the file check in the code to first look at the firmware directory and if it is not there THEN go to the boot directory rather than the other way around.