warrior: change the RefreshRend rule so it does not collide with the LPS rule

A rule should do what it states it does. In that case this is flashing the button when Rend should be refreshed. If the user wants a timer and a bad border, then he/she would enable the LPS rule

The problem with the old rule:
  - `BuildAuraHandler_Single` alters `model.expiration`, which in turn makes the button display the duration timer.
  - setting the highlight to "bad" is something the LPS rule takes care about

@Adirelle 
Does `GetAura(units["enemy"], 772, "HARMFUL PLAYER")` even make sense? Is it any different than `GetAura("target", 772, "HARMFUL PLAYER")`? Also, is it correct to assume, that the order of handling rules is LPS -> ABA -> custom rules?