AEM content sync root directory keeps getting reset after Maven -> Update Project

### Expected Behavior

In Eclipse, for the ui.apps project, importing an Archetype 24 maven project should result in an AEM content sync root directory of "src/main/content/jcr_root", but instead sets the content sync root to "src/main/resources".

If you update the content sync root to "src/main/content/jcr_root" and later run Maven -> Update Project, that action resets the content sync root directory back to "src/main/resources".

### Actual Behavior

Importing an Archetype 24 project initially sets the AEM Content sync root directory to "src/main/resources", and it gets reset to "src/main/resources" every time that Maven -> Update Project is run.

#### Steps to Reproduce

- Install latest Eclipse (currently version 2020-09).
- Install latest AEM Developer Tools for Eclipse (currently version 1.3.0).
- Create new archetype 24 maven project.
- Import project into Eclipse.
- Right click on ui.apps project and select Properties.
- In dialog, click on "AEM" section.
- See that content sync root directory is "src/main/resources".
- Change content sync root directory to "src/main/content/jcr_root"
- Right click on ui.apps project and select Maven -> Update Project.
- Click OK in dialog.
- Update runs.
- Right click on ui.apps project and select Properties again.
- In dialog, click on "AEM" section.
- See that content sync root directory has been reset to "src/main/resources".

#### Platform and Version

Archetype 24, Eclipse 2020-09

まず、記載されている Eclipse 2020-09、AEM Developer Tools 1.3.0、Archetype 24 の構成で問題を再現し、その後、Maven - Update Project 中に ui.apps の AEM content sync root がどのように処理されるかを調査します。プロジェクトのインポートと更新によって "src/main/content/jcr_root" が維持され、"src/main/resources" にリセットされなければ完了です。

索引モデルが issue の本文から書いたものです。