Use github URL for patch files

[sreichel]

Description (*)

Patch files are not found when installing OM via composer with custom magento-root-dir (like htdocs).

Related Pull Requests

1. See OpenMage/magento-lts#2861

Manual testing scenarios (*)

1. composer require openmage/magento-lts

  "extra": {
        "enable-patching": true,
        "magento-root-dir": "htdocs",
        "magento-core-package-type": "magento-source"
  }

2. "enable-patching": true, has to be added!

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All automated tests passed successfully (all builds are green)
• Add yourself to contributors list