fix config file set determination issues
concerning the code that produces the complete list of config files to take action on (read/delete/whatever)
- there was junk code left over from v2.0~24-1 where a script-specific config file loading feature was broken.
- some files were looked for even when variables were empty, such that filenames were "FILE." (a dot on the end).
- wrong variable name.
i have not currently assessed whether the arch & distro suffix feature is actually usable or whether it's also junk, same with the LB_CONFIG
feature. if both junk then the entire function could be junked.