MR640: Alloc -> Allocate naming fixes

Drop a workaround in get_struct_name_from_struct_type in vk_helper.py.

s/VK_STRUCTURE_TYPE_MEMORY_ALLOC_INFO/VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO/g
s/VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOC_INFO/VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO/g
s/VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOC_INFO/VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO/g

https://gitlab.khronos.org/vulkan/vulkan/merge_requests/640
diff --git a/tests/image_tests.cpp b/tests/image_tests.cpp
index 29f6abe..709595b 100644
--- a/tests/image_tests.cpp
+++ b/tests/image_tests.cpp
@@ -220,7 +220,7 @@
     VkMemoryRequirements mem_req;
 
     VkMemoryAllocateInfo mem_info = {};
-    mem_info.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOC_INFO;
+    mem_info.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
     mem_info.pNext = NULL;
 
     vkGetImageMemoryRequirements(device(), m_image, &mem_req);