Update nginx.conf to add PROPFIND and PROPPATCH to make Gestion app works

[Thatoo]

Problem

• Nextcloud’s Gestion app is not working : https://github.com/YunoHost-Apps/nextcloud_ynh/issues/627

Solution

Add PROPFIND and PROPPATCH to the nginx conf file

PR Status

• [ ] Code finished and ready to be reviewed/tested
• [ ] The fix/enhancement were manually tested (if applicable)

Automatic tests

Automatic tests can be triggered on https://ci-apps-dev.yunohost.org/ after creating the PR, by commenting "!testme", "!gogogadgetoci" or "By the power of systemd, I invoke The Great App CI to test this Pull Request!". (N.B. : for this to work you need to be a member of the Yunohost-Apps organization)

[tituspijean]

!testme

[yunohost-bot]

:rocket: