fix linter errors

Author: endarova

core_tests/products/tns_tests.py

@@ -6,8 +6,6 @@
 from core.enums.os_type import OSType
 from core.settings import Settings
 from core.utils.device.device_manager import DeviceManager
-from core.utils.file_utils import File
-from core.utils.wait import Wait
 from products.nativescript.tns import Tns
 from products.nativescript.tns_helpers import TnsHelpers