Remove vkCreateSwapchainKHR from ICD Dispatch table

Remove vkCreateSwapchainKHR from ICD Dispatch table

vkCreateSwapchainKHR and vkGetDeviceGroupSurfacePresentModesKHR were added to
the icd dispatch table then loaded with GIPA. While this is possible, for best
performance and consistency, the loader should use the device's dispatch table
for these functions. This required changing the terminators for both functions
so that they checked that the dev pointer isn't null and its dispatch entry for
each function isn't null.

Additionally, various debug marker/util functions checked if an ICD supported
surfaces by checking the ICD's dispatch table for vkCreateSwapchainKHR. These
have been updated to use the device's dispatch table instead.