test: move tui tests to tests/

Kept inline: tui src/client.rs tests::{api_client_builds_versioned_urls,api_client_update_url} - ApiClient::api/url private.

crates/tui/src/config.rs

@@ -76,7 +76,3 @@ impl Config {
         Ok(())
     }
 }
-
-#[cfg(test)]
-#[path = "tests/config.rs"]
-mod tests;