Fixes for biometrical auth for android

android/app/src/main/java/com/cakewallet/cake_wallet/MainActivity.java

@@ -1,6 +1,15 @@
 package com.cakewallet.cake_wallet;
 
-import io.flutter.embedding.android.FlutterActivity;
+import androidx.annotation.NonNull;
+import io.flutter.embedding.android.FlutterFragmentActivity;
+import io.flutter.embedding.engine.FlutterEngine;
+import io.flutter.plugins.GeneratedPluginRegistrant;
 
-public class MainActivity extends FlutterActivity {
-}
+
+public class MainActivity extends FlutterFragmentActivity {
+
+    @Override
+    public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
+        GeneratedPluginRegistrant.registerWith(flutterEngine);
+    }
+}

android/app/src/main/kotlin/com/cakewallet/cake_wallet/MainActivity.kt

@@ -1,6 +1,13 @@
 package com.cakewallet.cake_wallet
 
+import androidx.annotation.NonNull;
 import io.flutter.embedding.android.FlutterActivity
+import io.flutter.embedding.android.FlutterFragmentActivity
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.plugins.GeneratedPluginRegistrant
 
 class MainActivity: FlutterActivity() {
+    override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine){
+        GeneratedPluginRegistrant.registerWith(flutterEngine);
+    }
 }