Bug 503608

SUMMARY
After applying the "Move Data" operation on a Torrent, and making it move to another drive (hence, changing its mount_points dependency), the mount_points configuration stored (as seen in the Temporary Directory) is unchanged, causing problems, further down the line.

STEPS TO REPRODUCE
0. Have 2 mount points/ drive partitions/ physical disks
1. Download and Complete any torrent, such that it is on one of the partitions
2. In the Right click menu of the Torrent listing, use the "Move Data" action
3. For the move target directory, choose one that is on the other mount point
4. After the move operation finishes, in the Torrent listing right click menu go to -> Advanced -> Open Directory -> Temporary Directory
5. Open the "mount_points" file and read it

OBSERVED RESULT
The mount point shown in the file refers to the previous location's dependent mount point and has not changed since then.

EXPECTED RESULT
The mount_points change to represent the dependent mounts for the current location of the downloaded data files.

SOFTWARE/OS VERSIONS
KTorrent: 25.07.70 (master)
KDE Frameworks: 6.12.0
Qt: Using 6.9.0 and built against 6.9.0
EndeavourOS (Wayland)
Build ABI: x86_64-little_endian-lp64
Kernel: linux 6.14.2-arch1-1

ADDITIONAL INFORMATION
- The problem persists across application restarts (⇒ the application does not update the value on exit)
- If the mount point goes away in the future (e.g. you decommission the older drive after moving the data and the new drive is not on the same mount point), KTorrent will give an error for each mount point unavailability even though the data exists in the new location (i.e. Move target) and does not start the corresponding torrent
- At this point, using "Move Data" again DOES NOT fix the issue. And the only options remaining are, either to remove the torrent and open the torrent file again, or to manually edit the values in the Temporary Directory files and restart KTorrent.
- This also affects cases where the torrents are set to automatically move on completion