Alphabetically order groups in contact details (#2051)

[harryyoud]

fix #2051

[skjnldsv]

Thanks for this @harryyoud :)
When you open a PR, you can add the keyword "fix #2051" to make sure merging this will automatically close the associated issue.
Please also add a little bit of description, that really helps us review faster 😉 🚀

[welcome]

Thanks for your first pull request and welcome to the community! Feel free to keep them coming! If you are looking for issues to tackle then have a look at this selection: https://github.com/nextcloud/contacts/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22
Most developers hang out on IRC. So join #nextcloud-contacts and #nextcloud-dev on Freenode for a chat!

[droogi]

thanks