[1.7.3] Whitehoof racial bugs

[trungaczne]

Death Momentum charges start decaying when it hits 2 turns remaining (should be one)

If you constantly walk, Death momentum buff duration alternates between 2 and 3 remaining at each step (supposedly if it starts decaying at 2, and we go by the description, it should never reach 3)

Essence Drain removes duration indicator on the buff icon (should remain there like Lifeless Rush)

Essence Drain also mentions "only works on living creature" but there's nothing in the code that mentions this.