Additional fix for coversion from type-id to type-string.

Bug: 71486971

Test: header-abi-diff -arch arm64 -lib libcpp \
      -old tests/reference_dumps/arm64/libgolden_cpp.so.lsdump \
      -new tests/reference_dumps/arm64/libgolden_cpp_change_member_access.so.lsdump \
      -o libcpp_diff; libcpp_diff shows type strings for diffed fields.

Change-Id: If27a9d6d2fe9b6793a0f2da7f87247ee334ffd84