test: drop 'text=' prefix from charlie locators

charlie now treats bare strings as exact-match (was substring) and
RegExp as the explicit fuzzy escape hatch. The 'text=' prefix has
been removed and now throws a migration error from charlie.

Made-with: Cursor

test/test.js

@@ -22,10 +22,10 @@ describe('Application life cycle test', function () {
     }
 
     async function login(addr, pass) {
-        await goto(`https://${app.fqdn}/auth/sign_in`, 'text=Log in');
+        await goto(`https://${app.fqdn}/auth/sign_in`, 'Log in');
         await sendKeys('css=#user_email', addr);
         await sendKeys('css=#user_password', pass);
-        await click('text=Log in');
+        await click('Log in');
     }
 
     async function loginOidc() {