Don't include tags in atom ProxyBytesTransferByFgbg

Tagged stats are already included in untagged stats
in kernel BPF map, so including tagged stats without
logging the actual tags results in double-counting.

This is the reason why other similar atoms, such as
WifiBytesTransferByFgBg and MobileBytesTransferByFgBg
also query stats with includeTags set to false.

Test: manual, perfetto
Bug: 352699955
Flag: EXEMPT bugfix
Change-Id: I9d7c73633eb9c7d5973481533451bfbef1f77b00