remove battle gear 2 compat as its impossible to support mods w/ constantly changing API's

src/main/java/tconstruct/items/tools/Pickaxe.java

@@ -69,9 +69,4 @@ public class Pickaxe extends HarvestTool
         return "pickaxe";
     }
 
-    @Override
-    public boolean isOffhandHandDualWeapon ()
-    {
-        return false;
-    }
 }