fix: Remove constructor injection

frontend/e2e/homepage.spec.ts

@@ -10,7 +10,7 @@ test('home page loads correctly', async ({ page }) => {
 
 test('registration popup should open and close', async ({ page }) => {
   await page.goto('/');
-  await page.getByRole('navigation').getByRole('button', { name: 'Jetzt registrieren' }).click();
+  await page.getByRole('button', { name: 'Registrieren' }).click();
 
   await expect(page.getByText('Konto erstellenE-')).toBeVisible();
 
@@ -21,7 +21,7 @@ test('registration popup should open and close', async ({ page }) => {
 
 test('registration should work', async ({ page }) => {
   await page.goto('/');
-  await page.getByRole('navigation').getByRole('button', { name: 'Jetzt registrieren' }).click();
+  await page.getByRole('button', { name: 'Registrieren' }).click();
 
   await page.getByRole('textbox', { name: 'E-Mail' }).fill('test@kjan.email');
   await page.getByRole('textbox', { name: 'Benutzername' }).fill('test-playwright');