Stone Wardens correctly gain physical power from shields

git-svn-id: http://svn.net-core.org/repos/t-engine4@6203 51575b47-30f0-44d4-a5cc-537603b46e54

game/modules/tome/class/interface/Combat.lua

@@ -1143,7 +1143,7 @@ function _M:combatPhysicalpower(mod, weapon, add)
 
 	if not weapon then
 		local inven = self:getInven(self.INVEN_MAINHAND)
-		if inven and inven[1] then weapon = inven[1].combat else weapon = self.combat end
+		if inven and inven[1] then weapon = self:getObjectCombat(inven[1], "mainhand") else weapon = self.combat end
 	end
 
 	add = add + 10 * self:combatCheckTraining(weapon)