lavapipe: don't overwrite entire VkFormatProperties3 struct
this clobbers pNext and breaks tooling, as found by Panagiotis Apostolou
Fixes: f72d5a93 ("lavapipe: KHR_format_feature_flags2")
this clobbers pNext and breaks tooling, as found by Panagiotis Apostolou
Fixes: f72d5a93 ("lavapipe: KHR_format_feature_flags2")