vktWsiSwapchainTests: fixed bugs and removed unnecessary barriers.
* VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR may be unsupported - use transform returned from API
* `capabilities.maxImageCount == 0` means no limits, test should account for that
* Additionally two barriers are removed - they are unnessary, as given transitions are already performed by renderpass
* do not depend on optional depth clamp feature
* fixed bug in surface capabilities validation where surface's height was tested with respect to width's limits.
See merge request !559