Fix minor color bug

If we are not using RED then the Color should be the terminal default
not 7

src/display.rs

@@ -1,6 +1,7 @@
 extern crate ansi_term;
 
 use self::ansi_term::Colour::Fixed;
+use self::ansi_term::Style;
 use std::collections::HashSet;
 
 static UNITS: [char; 4] = ['T', 'G', 'M', 'K'];
@@ -171,7 +172,7 @@ pub fn format_string(
         if is_biggest {
             Fixed(196).paint(size)
         } else {
-            Fixed(7).paint(size)
+            Style::new().paint(size)
         },
         indentation,
         printable_name,

src/main.rs

@@ -88,7 +88,7 @@ fn main() {
     let biggest_ones = {
         match depth {
             None => find_big_ones(sorted_data, number_of_lines + simplified_dirs.len()),
-            Some(d) => trim_deep_ones(sorted_data, d, &simplified_dirs)
+            Some(d) => trim_deep_ones(sorted_data, d, &simplified_dirs),
         }
     };
     draw_it(permissions, !use_full_path, depth, simplified_dirs, biggest_ones);

src/tests.rs

@@ -279,4 +279,3 @@ fn recursive_sym_link_output(dir: &str, link_name: &str) -> String {
         format_string(link_name, true, true, "   0B", " └──",),
     )
 }
-