test: use getText helper instead of executeScript

executeScript is being removed from charlie's public API; getText with
an attribute name reads element attributes (here: img src) directly.

Made-with: Cursor

test/test.js

@@ -10,7 +10,7 @@ import {
     clearCache,
     click,
     cloudronCli,
-    executeScript,
+    getText,
     goto,
     loginOIDC,
     sendKeys,
@@ -51,10 +51,7 @@ describe('Application life cycle test', function () {
 
     async function checkAvatar() {
         await goto(`https://${app.fqdn}/${username}`, '//div[@id="profile-avatar"]/a/img');
-        const avatarSrc = await executeScript(() => {
-            const el = document.querySelector('#profile-avatar a img');
-            return el ? el.getAttribute('src') : null;
-        });
+        const avatarSrc = await getText('//div[@id="profile-avatar"]/a/img', 'src');
         assert.ok(avatarSrc);
         const avatarUrl = new URL(avatarSrc, `https://${app.fqdn}`).href;
         const response = await superagent.get(avatarUrl);