importing files once imported does not remove deleted files

[ljubomirb]

Describe the bug
When using feature "import files", and import file from some other directory, then when into original directory some files are manually added, you can always click "import files" in cloudreve, and new files will import (be shown in list), but deleted ones will not be removed.

Expected behavior
I expected that file structure of a foreign directory, shown in cloudreve represents current structure of imported folder.