Allow to select either Onlyoffice or Collabora if both suites are installed on the Nextcloud server

### Steps to reproduce
1. Open ODT or DOCX file or other supported document types.

### Expected behaviour
- In the context menu, an option to select "Open with Collabora" and "Open with Onlyoffice" should show up if both office suites are installed on the Nextcloud server. This is more consistent with the web interface of Nextcloud.

### Actual behaviour
- Currently ODT is opened with Collabora and DOCX gets opened with Onlyoffice. Onlyoffice only allows viewing of the document because of the removal of editing features in their Open Source version.

### Environment data
Android version: Lineageos 16.1/Android 9

Device model: BQ Aquaris X Pro

Stock or customized system: Custom ROM

Nextcloud app version: 3.10

Nextcloud server version: 18.0.3