Add hasDisplay check after createWsiDisplay throws

Add hasDisplay check after createWsiDisplay throws

Commit b7efacd7b3 (Check if CTS has platform display for wsi-type) added
checks after createWsiDisplay failure to prevent reporting test failure
if native display for requested wsi-type isn't avaiable. This situation
can occur if vulkan driver supports multiple wsi extensions and only one
native display is available. Change did not fix all the places where
createWsiDisplay is called. The check is missing in file
vktImageMutableTests.cpp so fix it.

Affects: dEQP-VK.image.swapchain_mutable.*

Components: Vulkan, Framework

VK-GL-CTS issue: 1558

Change-Id: Iffc50a70ed48fb18c4d609c8d74b8e4615e4297d