Fix android new engine in group (#49659)

Fix android `FlutterFragmentActivity.createFlutterFragment()` new engine in group.

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style

shell/platform/android/io/flutter/embedding/android/FlutterFragmentActivity.java

diff --git a/shell/platform/android/io/flutter/embedding/android/FlutterFragmentActivity.java b/shell/platform/android/io/flutter/embedding/android/FlutterFragmentActivity.java
index 7707534..2a782ac 100644
--- a/shell/platform/android/io/flutter/embedding/android/FlutterFragmentActivity.java
+++ b/shell/platform/android/io/flutter/embedding/android/FlutterFragmentActivity.java
@@ -572,8 +572,7 @@
               + shouldAttachEngineToActivity());
 
       if (getCachedEngineGroupId() != null) {
-        return flutterFragment
-            .withNewEngineInGroup(getCachedEngineGroupId())
+        return FlutterFragment.withNewEngineInGroup(getCachedEngineGroupId())
             .dartEntrypoint(getDartEntrypointFunctionName())
             .initialRoute(getInitialRoute())
             .handleDeeplinking(shouldHandleDeeplinking())