mise: drop the settings block - `yes` is ignored in project configs

Since mise 2026.6.4 (advisory GHSA-436v-8fw5-4mj8), trust-control settings
(`yes`, `ci`, `trusted_config_paths`, `paranoid`) in non-global configs are
ignored, and every mise invocation prints a warning about this one.
Removing it changes nothing on current mise - the setting was already dead.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

mise.toml

@@ -4,6 +4,3 @@
 
 [tools]
 prek = "0.4.13"
-
-[settings]
-yes = true