Use default admin credentials for tests

tests/data/user.js

@@ -2,6 +2,6 @@ export const username = 'user.test.'+Date.now();
 export const email = username+'@rocket.chat';
 export const password = 'rocket.chat';
 
-export const adminUsername = 'admin.test';
+export const adminUsername = 'rocketchat.internal.admin.test';
 export const adminEmail = adminUsername+'@rocket.chat';
-export const adminPassword = 'rocket.cat';
\ No newline at end of file
+export const adminPassword = adminUsername;