fix(dav): Fix share token pattern for base uri extraction

[provokateurin]

• Resolves: [Bug]: Using hyphens in customized share link results in error #51353

Summary

The pattern wasn't allowing - because it didn't match

server/apps/files_sharing/lib/Controller/ShareAPIController.php

Line 1381 in 78b31ca

if (!preg_match('/^[a-z0-9-]+$/i', $token)) {

.

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[provokateurin]

/backport to stable31

[Pytal]

Thanks!

[skjnldsv]

/backport to stable31