Do not ignore folders in already ignored folder

[pkuczynski]

I had this output when running asimov:

/Users/yyy/Projects/xxx/node_modules/postcss-minify-params/node_modules has been excluded from Time Machine backups

There should be no need to do that, as /Users/yyy/Projects/xxx/node_modules/ is already ignored...

[stevegrunwell]

Hey @pkuczynski, thank you for bringing this to our attention! Checking to see (at the very least) if one of the parent directories matches the directory being searched for (e.g. a node_modules/ directory within a node_modules/ directory) could reduce the number of hits and speed up the process.

[Eneris]

+1 on this