Fix default find regexes

[zemja]

Fuck, sorry, I broke things yesterday with the Syncthing regex.emacs-conflict--get-normal-filename wouldn't return the file extension for files WITH an extension, but would work fine for files without.

This now works properly, I swear to God.

[ibizaman]

Hey no worries! At least half of the issue falls on me for not reviewing thoroughly. Regex are hard…

If you don’t mind I’ll merge your PR when I added some testing around it.

[zemja]

Hi, just to mention I broke this quite badly with my last PR (files with a . in the name don't work), so I'd encourage you to revert that last commit before you get around to reviewing this one. For the sake of everybody pulling this repo automatically in their init.el :)

[ibizaman]

@zemja that makes sense. I just did :)