fix: Let the line number width start at 1

	fix: rust-lang#57

Author: chengr4

src/renderer/display_list.rs

@@ -79,7 +79,7 @@ impl<'a> Display for DisplayList<'a> {
             })
         });
         let lineno_width = if lineno_width == 0 {
-            lineno_width
+            1
         } else if self.anonymized_line_numbers {
             ANONYMIZED_LINE_NUM.len()
         } else {