Output is not sorted with --sort option

[1hakusai1]

version: 13.0.0-alpha.7

Steps to reproduce

# run tokei in this repository itself
cargo run -- --sort code

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 Language              Files        Lines         Code     Comments       Blanks
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 JSON                      1         2044         2044            0            0
 TOML                      3          126          105            5           16
 Shell                     1           49           38            1           10
 BASH                      4           48           30           10            8
─────────────────────────────────────────────────────────────────────────────────
 Rust                     24         4574         3851          138          585
 |- Markdown              14          394            5          335           54
 (Total)                             4968         3856          473          639
─────────────────────────────────────────────────────────────────────────────────
 HTML                      1           12            9            1            2
 |- JavaScript             1           15           11            4            0
 (Total)                               27           20            5            2
─────────────────────────────────────────────────────────────────────────────────
 Markdown                  5         1723            0         1384          339
 |- BASH                   1            3            3            0            0
 |- JSON                   1           46           46            0            0
 |- Rust                   1            7            4            3            0
 |- Shell                  1           16           14            0            2
 (Total)                             1795           67         1387          341
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 Total                    39         9057         6160         1881         1016
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Languages which have no child are listed first. In this example, I think the correct order is Rust -> JSON -> TOML ..., but I’m not sure if this behavior is as expected.

If this is a bug, I will create my own PR to fix it.