fix: revert removal of WTFPL from deny.toml

[joshka]

This is actually used for terminfo (transitively from termwiz

error[rejected]: failed to satisfy license requirements
  ┌─ terminfo 0.7.5 (registry+https://github.com/rust-lang/crates.io-index):4:12
  │
4 │ license = "WTFPL"
  │            ^^^^^
  │            │
  │            license expression retrieved via Cargo.toml `license`
  │            rejected: not explicitly allowed
  │
  = terminfo v0.7.5
    └── termwiz v0.20.0
        └── ratatui v0.21.0

advisories ok, bans ok, licenses FAILED, sources ok

[codecov]

Codecov Report

Merging #266 (f8c3def) into main (6c2fbbf) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #266   +/-   ##
=======================================
  Coverage   81.76%   81.76%           
=======================================
  Files          34       34           
  Lines        6591     6591           
=======================================
  Hits         5389     5389           
  Misses       1202     1202