[DynInst_API:] [dyninst/dyninst] d7047e: Fix inverted logic in DwarfDyninst::is_cudie (#1505)

[Tim Haines <noreply@xxxxxxxxxx>]

  Branch: refs/heads/master
  Home:   https://github.com/dyninst/dyninst
  Commit: d7047e2d22ab5f7bb2a0b8b37434ed955ab97f29
      https://github.com/dyninst/dyninst/commit/d7047e2d22ab5f7bb2a0b8b37434ed955ab97f29
  Author: Tim Haines <thaines.astro@xxxxxxxxx>
  Date:   2023-09-05 (Tue, 05 Sep 2023)

  Changed paths:
    M dwarf/h/dwarf_cu_info.hpp

  Log Message:
  -----------
  Fix inverted logic  in DwarfDyninst::is_cudie (#1505)

If a DIE is a CU, then it contains a reference to its Dwarf_CU.

Introduced by 71f2e14d3 (PR1499).