Fix d_a_obj_stone bound crashing due to accessing a field improperly

Different vtable layout on mwerks made this direct pointer cast not work. access the field instead.

Also I went searching if there's any other cases of this bug, didn't find any but did find something else to clean up.

src/d/actor/d_a_npc_tk.cpp

@@ -2518,7 +2518,7 @@ void daNPC_TK_c::executeResistanceDemo() {
                            0x200, 0x10);
         shape_angle.x = -current.angle.x;
 
-        cLib_addCalcAngleS(&current.angle.y, cLib_targetAngleY((Vec*)&current, &posWithOffset), 8,
+        cLib_addCalcAngleS(&current.angle.y, cLib_targetAngleY(&current.pos, &posWithOffset), 8,
                            0x400, 0x10);
         shape_angle.y = current.angle.y;