fix(filesDrop): drag-and-drop folder upload directories

[solracsf]

• Resolves: Drag'n'drop Folders to a Team Folder doesn't work groupfolders#4515

Summary

When dragging and dropping a folder structure into any non-root destination (group folders, subfolders), subdirectories were created at the wrong WebDAV path. For team folders, the directory was created in the user's personal files entirely. Files then failed to upload because the target directory didn't exist in the team folder.

Pass the destination (IFolder) to createDirectoryIfNotExists so it uses destination.source as its WebDAV base URL, as uploader.upload already does.

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)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

AI (if applicable)

• The content of this PR was partly or fully generated using AI

[susnux]

Should already be fixed with #58680