Core/Units: removed PvE level delta based block chance bonus

* according to simulationcraft there is no sign of it being real

src/server/game/Entities/Unit/Unit.cpp

@@ -2521,6 +2521,7 @@ float Unit::GetMeleeMissChance(Unit const* victim) const
 float Unit::GetUnitBlockChance(Unit const* victim) const
 {
     float chance = 0.f;
+
     if (Player const* playerVictim = victim->ToPlayer())
     {
         if (playerVictim->CanBlock())
@@ -2536,11 +2537,6 @@ float Unit::GetUnitBlockChance(Unit const* victim) const
         {
             chance = 5.0f;
             chance += victim->GetTotalAuraModifier(SPELL_AURA_MOD_BLOCK_PERCENT);
-
-            int32 const levelDiff = victim->getLevelForTarget(this) - getLevelForTarget(victim);
-
-            if (levelDiff > 0)
-                chance += 0.2f * levelDiff;
         }
     }