It's quite illogical behavior not to remove keystores from disk when they were removed in Keystores Manager. User can
create keystore with Keystores Manager, and it's quite reasonable to expect that keystore removal will cause removal of
file from disk, but not only item from list in Keystore Manager window.

If user creates keystores in Keystores Manager it's quite unlikely, that keystore is used in some other applicaitons.
Anyway user can be warned about removal of file from disk and possible problems, also 3 options can be provided: remove
file and item from list, remove only item from list, cancel removal.
Otherwise user has to remove a keystore 2 times: in Keystores Manager and from file system manually (especially strange
if it was created by Keystores Manager).