.gitignore entry ignored depending on path parameter

[mengelbrecht]

Depending on the path parameter supplied to ripgrep on the commandline .gitignore patterns are ignored.

Setup:

$ mkdir -p test/foo/bar
$ touch test/foo/bar/baz
$ echo 'foo/bar' > test/.gitignore

When run with test as path parameter the bar directory is not ignored.

$ rg --debug --files "" test
DEBUG:grep::search: regex ast:
Empty
DEBUG:rg::ignore: test/.gitignore ignored because it is hidden
test/foo/bar/baz

When run inside test it is correctly ignored:

$ cd test
$ rg --debug --files ""
DEBUG:grep::search: regex ast:
Empty
DEBUG:rg::ignore: ./.gitignore ignored because it is hidden
DEBUG:rg::ignore: ./foo/bar ignored by Pattern { from: "./.gitignore", original: "foo/bar", pat: "foo/bar", whitelist: false, only_dir: false }

[BurntSushi]

I think this is a dupe of #25. I'll be sure to include your setup as a regression test.

[BurntSushi]

Actually, this is a dupe of #16. Fix incoming.