enh: refactor pin check by removing useless tmp local var

integration_test/utility/tests_utility.dart

lib/providers/home.dart

lib/providers/substrate_sdk.dart

lib/providers/wallet_options.dart

lib/providers/wallets_profiles.dart

lib/screens/home.dart

lib/screens/myWallets/change_pin.dart

lib/screens/myWallets/chest_options.dart

lib/screens/myWallets/choose_chest.dart

lib/screens/myWallets/custom_derivations.dart

lib/screens/myWallets/import_g1_v1.dart

lib/screens/myWallets/manage_membership.dart

lib/screens/myWallets/migrate_identity.dart

lib/screens/myWallets/restore_chest.dart

lib/screens/myWallets/show_seed.dart

lib/screens/myWallets/unlocking_wallet.dart

lib/screens/myWallets/wallet_options.dart

lib/screens/my_contacts.dart

lib/screens/onBoarding/1.dart

lib/screens/onBoarding/2.dart