Replace all t.ctx with t

Not sure if that's the way to go because, you know, merge conflicts, but
we could do this now.

src/configure/mod.rs

@@ -616,15 +616,15 @@ mod tests {
     #[async_std::test]
     async fn test_no_panic_on_bad_credentials() {
         let t = TestContext::new().await;
-        t.ctx
+        t
             .set_config(Config::Addr, Some("probably@unexistant.addr"))
             .await
             .unwrap();
-        t.ctx
+        t
             .set_config(Config::MailPw, Some("123456"))
             .await
             .unwrap();
-        assert!(t.ctx.configure().await.is_err());
+        assert!(t.configure().await.is_err());
     }
 
     #[async_std::test]