Convert boolean true to VARIANT_TRUE

LuaCOM [convert true to 1](https://github.com/davidm/luacom/blob/master/src/library/tLuaCOMTypeHandler.cpp#L664-L667) not to VARIANT_TRUE (wich is -1)

``` C++
  case LUA_TBOOLEAN:
    varg.vt = VT_BOOL;
    varg.boolVal = lua_toboolean(L, luaval);
```

Some Interfaces does not accept this value as true. (e.g. INetFwRule).
