Curseforge install fails to create directory when addon is unnested

[m-triassi]

Description

When installing an addon that contains its files in the top level directory, ie: addon files are directly zipped without a containing folder, an error is raised.

Expected Behavior

When a zipped file immediately contains addon files, it should deposit those files into a containing directory

Actual Behavior

The unzip loop in curseforge.go:145 attempts to loop over files (lua, markdown, etc...) treating them as folders to be deposited in the dest directory. This causes an error to be thrown.