Fix bug in VmaAllocator_T::AllocateVulkanMemory for case when HeapSizeLimit is used
Fix bug in VmaAllocator_T::AllocateVulkanMemory for case when HeapSizeLimit is used

Closes #89 - thanks @JustSid !

GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator,GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator,GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator