Do not ignore pattern start with ./

[zanminkian]

This PR fix 2 issues:

Issue 1: trim gitignore file content

Issue 2: pattern starts with ./ or ./ should not be ignored

foo
├── .gitignore ---> content: ./bar.js
└── bar.js ---> should not be ignored, but actually ignored by globby

[fisker]

• Handle trailing whitespaces:
• 'a '(one space) should not match 'a '(two spaces).
• 'a \ ' matches `'a '

Quote from https://github.com/kaelzhang/node-ignore/tree/master?tab=readme-ov-file#why-another-ignore. It seems spaces are useful.

[zanminkian]

I'm not pretty sure about issue 1 so I updated this PR.