fix(tests): skip config.save() in config_editor unit tests

Tests using execute_action() triggered Config::save() with a default
Config, silently overwriting ~/.config/owlry/config.toml on every
`cargo test` run. Guard the save call with #[cfg(not(test))].

crates/owlry-core/src/providers/config_editor.rs

@@ -70,6 +70,7 @@ impl ConfigProvider {
             false
         };
 
+        #[cfg(not(test))]
         if result
             && let Err(e) = cfg.save()
         {