fix: remove $schema key from yazi.toml

Yazi's newer TOML parser requires kebab-case key names.
$schema starts with a non-letter character, causing:
  TOML parse error at line 3: must be a kebab-cased string

yazi/.config/yazi/yazi.toml

@@ -1,6 +1,5 @@
 # A TOML linter such as https://taplo.tamasfe.dev/ can use this schema to validate your config.
 # If you encounter any issues, please make an issue at https://github.com/yazi-rs/schemas.
-"$schema" = "https://yazi-rs.github.io/schemas/yazi.json"
 
 [mgr]
 ratio          = [ 1, 4, 3 ]