[SG-823] Undid changes to capture device push token on login (#2427)

* Revert "Set Id property on existing devices so we don't try to create a new one instead of updating existing. (#2420)"

This reverts commit 02e4b10ae8.

* Revert "Update push token on login to allow multiple users on mobile devices (#2404)"

This reverts commit 24469e2267.

* Added back test changes.

src/Core/Services/IDeviceService.cs

@@ -7,5 +7,4 @@ public interface IDeviceService
     Task SaveAsync(Device device);
     Task ClearTokenAsync(Device device);
     Task DeleteAsync(Device device);
-
 }

src/Core/Services/Implementations/DeviceService.cs

@@ -41,7 +41,6 @@ public class DeviceService : IDeviceService
     public async Task DeleteAsync(Device device)
     {
         await _deviceRepository.DeleteAsync(device);
-
         await _pushRegistrationService.DeleteRegistrationAsync(device.Id.ToString());
     }
 }