Fix memory maps with offsets not being properly recorded

renderdoc/driver/vulkan/wrappers/vk_resource_funcs.cpp

@@ -383,7 +383,7 @@ VkResult WrappedVulkan::vkMapMemory(VkDevice device, VkDeviceMemory mem, VkDevic
       // ensure size is valid
       RDCASSERT(size == VK_WHOLE_SIZE || (size > 0 && size <= memrecord->Length));
 
-      state.mappedPtr = (byte *)realData;
+      state.mappedPtr = (byte *)realData - (size_t)offset;
       state.refData = NULL;
 
       state.mapOffset = offset;