[Warrior] Fix Sweeping Strikes damage

Sweeping Strikes ability uses spell 26654 which causes normalized weapon damage (Effect 0: Id 121 - SPELL_EFFECT_NORMALIZED_WEAPON_DMG) af50ce6223ded9aa91a087556f2332b9c1f13df8, while it should work similar to Blade Flurry (copy damage).

Before WotLK there was a check for damage copied from Execute (second target must be under 20% hp as well, else do normalized damage - cast 26654), but as for 3.x.x there seems to be no such check (http://www.wowhead.com/spell=12328#comments:id=748811). Spell 26554 is also used in Cata (http://www.wowhead.com/spell=26654#comments)

http://www.wowwiki.com/Sweeping_Strikes
http://www.wowhead.com/spell=12328#comments