Core/Spells: Fix a small proc-issue with Warlpcl T10 4P bonuses (Devious Minds)

Same functionality as for 70728 (Exploit Weakness) - thanks to Svetilo for the heads up

--HG--
branch : trunk

src/server/game/Spells/SpellMgr.cpp

@@ -3890,6 +3890,7 @@ void SpellMgr::LoadSpellCustomAttr()
             count++;
             break;
         case 70728: // Exploit Weakness
+        case 70840: // Devious Minds
             spellInfo->EffectImplicitTargetB[0] = TARGET_UNIT_PET;
             count++;
             break;