fix incorrect view reset when unmounting similarly-named devices

fix incorrect view reset when unmounting similarly-named devices

Previously, unmounting a device would incorrectly reset views containing:
- Paths with similar names (e.g. "/media/disk" and "/media/disk_2")
- Substrings of the mounted path

Now only resets views showing either:
1. The exact mounted path (e.g. "/media/disk")
2. Its subdirectories (e.g. "/media/disk/docs")