Fix issues with non-escaped folder paths

[Austinate]

This PR addresses issues with folder paths containing whitespaces (in our case it is similar to "Project Name" and containing folder with source files has same "Project name" too).

• First of all it removes changes made by #63 (sorry). Reason: It was wrong to escape Dir.pwd on that level since when it was used here it was causing and error because Dir.chdir for some reason fails if path is escaped Solution: escape dir_selected only in find_swift_files where it is compared with escaped files paths

• Fixes escaping in find_swift_files function. Reason: When relative file path was first escaped and only after expanded it was producing such results in our case:

  relative file path: 
  "Project\ Name/Swiftlinttestfile.swift"
  absolute file path: 
  "/Users/user/Documents/Projects/Project Name/Project\  Name/Swiftlinttestfile.swift"

  which resulted in unusable file path/

  Solution: First expand, then escape. Also escape used dir_selected in this function because in other case this code will return no files every time:

     # Ensure only files in the selected directory
      select { |file| file.start_with?(dir_selected) }.

[Austinate]

Thanks for review and nice words, @ashfurrow 😀 Should we publish a new version with this changes? Any advice on this would be nice 🙏

[ashfurrow]

Yeah, good idea. I bumped the version and pushed to RubyGems. Thanks again for looking into this – I've been swamped and really appreciate it.