fix: escape src dir while crawling fs

[demetris-manikas]

Solves situations where the directory name is like "pa[ck]this"

[develar]

glob is not a regexp. So, using escape-string-regexp is not fully correct.

Also, what electron-packager want — just ask pack the whole dir. It is not expected that path will be as a pattern.

So, I don't like current solution — we don't need to fight against asar/glob. Instead, should be a way to disable glob. And use path just as path, not as a pattern.

cc: @malept

[develar]

Issue: electron-userland/electron-builder#371 (comment)