closes #2843 Previously, bad partial matches between cwd and target buffer path would result in non-cwd buffers showing up in the picker despite using `only_cwd=true`. eg. cwd = `/foo/bar` target buffer = `foo/bar1/baz.txt` The target buffer starts with the cwd path. This is fixed by appending a path separator before comparing/matching: eg. cwd = `/foo/bar/` target buffer = `foo/bar1/baz.txt`