Just set UDSEntry::UDS_NAME to the actual directory name instead of the hardcoded string "folder" and don't set UDSEntry::UDS_DISPLAY_NAME at all

Summary: There is no reason to set UDSEntry::UDS_NAME to "folder" and then override it with UDSEntry::UDS_DISPLAY_NAME

Test Plan:
Apply patch, click android device in dolphin's Devices list
Verify phones sdcards are listed as befor

Reviewers: KDE Connect, albertvaka

Reviewed By: KDE Connect, albertvaka

Subscribers: albertvaka, kdeconnect

Tags: KDE Connect

Differential Revision: https://phabricator.kde.org/D18223