Improve test for native swipe

[fylyppo]

We should have regression tests for Android and iOS native swipes. We have tests as:

• https://github.com/leancodepl/patrol/blob/master/dev/e2e_app/integration_test/pull_to_refresh_test.dart
• https://github.com/leancodepl/patrol/blob/master/dev/e2e_app/integration_test/swipe_back_test.dart
• https://github.com/leancodepl/patrol/blob/master/dev/e2e_app/integration_test/swipe_test.dart but this one doesn't have assert which makes sure that this swipe was really performed on the screen So lets update swipe_test with some assert