Change behavior of depth flag

Change the depth flag so that it only changes the depth of displayed
subdirectories, not the depth of the directory size calculation (i.e.,
changing --depth does not change the displayed directory size, rather it
only changes how many levels of subdirectories are shown).

src/main.rs

@@ -181,7 +181,6 @@ fn main() {
         limit_filesystem,
         by_filecount,
         show_hidden,
-        depth,
     );
     let sorted_data = sort(nodes);
     let biggest_ones = {