Fix price and rate calculation (WARN - it will allow prices be not integer)

[JackBekket]

Problem:
https://github.com/MoonSHRD/MS-Factory/blob/feat/hold/contracts/721/singleton/TicketFactory721.sol#L86
Unneccesarity conversion from wei to ether at contract side

This conversion should be done at client side

Way to solution:

1. remove conversion from
   https://github.com/MoonSHRD/MS-Factory/blob/feat/hold/contracts/721/singleton/TicketFactory721.sol#L86

2. refactor
   uint256 ta = (weiAmount / (1 ether)) / (_rate / (1 ether));
   to
   uint256 ta = weiAmount / _rate;
   at
   https://github.com/MoonSHRD/MS-Factory/blob/feat/hold/contracts/721/singleton/TokenSale721.sol#L247

3. add web3.toWei conversion at client side, in moment, when we setting up price