Get rid of detailed: true option on readdirFilter functions

[mhkeller]

I have never ended up using this. If I need the filename I do const fileName = path.basename(fullPath). This option adds a lot of complexity and has been holding up implementing #71 because of how to handle the multiple object types.

This was a recent edition and kinda in the weeks so I'm not sure if anyone is actually using this option. If there are no objections @aubergene @1wheel I will remove and add the recursive option, which is much more useful.

[1wheel]

I didn't know there was a detailed option! Won't miss it.