check khr_android_surface in terminator_CreateAndroidSurfaceKHR

[aizu-m]

Reading down the surface-creation terminators in wsi.c to check each one gates on its own extension, this line did not match:

loader/wsi.c:1371:  if (!loader_inst->enabled_extensions.khr_display) {

terminator_CreateAndroidSurfaceKHR implements VK_KHR_android_surface but checks the khr_display flag. Every sibling terminator checks its own extension, and the vkGetInstanceProcAddr entry for vkCreateAndroidSurfaceKHR (wsi.c:3016) already gates on khr_android_surface.

Behaviour with the wrong flag: an instance that enables VK_KHR_android_surface but not VK_KHR_display has vkCreateAndroidSurfaceKHR rejected with VK_ERROR_EXTENSION_NOT_PRESENT, and one that enables VK_KHR_display without VK_KHR_android_surface can create an Android surface with the extension off.

Pointed the check and the log message at khr_android_surface.

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