[fenix] For https://github.com/mozilla-mobile/fenix/issues/26934 fix showDefaultHomeScreen screenshot test

app/src/androidTest/java/org/mozilla/fenix/screenshots/DefaultHomeScreenTest.kt

@@ -43,7 +43,6 @@ class DefaultHomeScreenTest : ScreenshotTest() {
     @Test
     fun showDefaultHomeScreen() {
         homeScreen {
-            swipeToBottom()
             verifyAccountsSignInButton()
             Screengrab.screenshot("HomeScreenRobot_home-screen-scroll")
             TestAssetHelper.waitingTime

app/src/androidTest/java/org/mozilla/fenix/ui/robots/HomeScreenRobot.kt

@@ -706,9 +706,11 @@ private fun assertStartSyncHeader() {
     onView(allOf(withText(R.string.onboarding_account_sign_in_header)))
         .check(matches(withEffectiveVisibility(Visibility.VISIBLE)))
 }
-private fun assertAccountsSignInButton() =
+private fun assertAccountsSignInButton() {
+    scrollToElementByText(getStringResource(R.string.onboarding_firefox_account_sign_in))
     onView(ViewMatchers.withResourceName("fxa_sign_in_button"))
         .check(matches(withEffectiveVisibility(Visibility.VISIBLE)))
+}
 
 private fun assertChooseThemeHeader() {
     scrollToElementByText("Choose your theme")