[INTERNAL] sap.m.TileContainer: unit tests now run successfuly on Edge browser
[INTERNAL] sap.m.TileContainer: unit tests now run successfuly on Edge browser

Problem description:
Unit test logic depends on sap.ui.Device module in order to simulate
different devices and make the needed assertions.
In Edge browser sap.ui.Device.system object has different initial set up
than in other browsers.

Solution:
We use fake data for sap.ui.Device.system object in the tests in order
to simulate the same set up of the sap.ui.Device object in all browsers.

Change-Id: I0e4ecabab5e2b34e2d16dd513e4bafb54552c3c2

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5