fix: deep match with higher level siblings

[RedHatter]

The level parameter was being incremented at each loop iteration instead of only inside of a new walk call. So for example

├── a          <- level 0
├── b          <- level 1 (should be 0)
│   ├── c      <- level 2 (should be 1)

[terkelg]

Thank you so much @RedHatter – I'll merge this over the weekend

[benmccann]

This PR is causing two tests to fail:

  glob: glob
    ✖ should be equivalent
    -----------------------
      operator: deepEqual
      expected: |-
        [ 'test/fixtures/a.js', 'test/fixtures/a.mp3', 'test/fixtures/a.txt', 'test/fixtures/b.js', 'test/fixtures/b.txt', 'test/fixtures/ond', 'test/fixtures/one', 'test/fixtures/two' ]
      actual: |-
        [ 'test/fixtures/a.js', 'test/fixtures/a.mp3', 'test/fixtures/a.txt', 'test/fixtures/b.js', 'test/fixtures/b.txt', 'test/fixtures/deep', 'test/fixtures/ond', 'test/fixtures/one', 'test/fixtures/two' ]
      at: <anonymous> (test/glob.js:11:7)
      stack: |-
  glob: options.filesOnly
    ✖ should be equivalent
    -----------------------
      operator: deepEqual
      expected: |-
        [ 'test/fixtures/a.js', 'test/fixtures/a.mp3', 'test/fixtures/a.txt', 'test/fixtures/b.js', 'test/fixtures/b.txt', 'test/fixtures/ond', 'test/fixtures/one', 'test/fixtures/two' ]
      actual: |-
        [ 'test/fixtures/a.js', 'test/fixtures/a.mp3', 'test/fixtures/a.txt', 'test/fixtures/b.js', 'test/fixtures/b.txt', 'test/fixtures/deep', 'test/fixtures/ond', 'test/fixtures/one', 'test/fixtures/two' ]
      at: <anonymous> (test/glob.js:11:7)
      stack: |-