remove explicit timeout for polling as well

src/usecases/signup.js

@@ -68,7 +68,7 @@ module.exports = async function signup(session, username, password, homeserver)
     const foundHomeUrl = await session.poll(async () => {
         const url = session.page.url();
         return url === session.url('/#/home');
-    }, 5000);
+    });
     assert(foundHomeUrl);
     session.log.done();
 }