When forming a truncated name, use the "[...]" prefix even for

When forming a truncated name, use the "[...]" prefix even for
an extremely long name in the current directory.

* src/remove.c (full_filename_): Rename a local variable.
Use two separate "truncated" variables, in case the second
call to right_justify does not indicate any truncation -- which
would happen only if the single component FILENAME were longer
than 511 bytes and DIR_NAME were empty.