[FAB-12215]WYFA:Remove chainId in tx proposal request

A sample application in Write Your First Application has an
unnecessary parameter “chainId” in a transaction proposal request.
Since a channel name is included in a channel object, it is not
required in a request.

This CR removes the parameter ”chainId” from the sample code.

FAB-12215 #done

Change-Id: I1e9b24c791a2129534766805855d05e78b050149
Signed-off-by: Yuki Kondo <yuki.kondo@hal.hitachi.com>

fabcar/javascript-low-level/invoke.js

@@ -77,7 +77,6 @@ async function invoke() {
  chaincodeId: 'fabcar',
  fcn: 'createCar',
  args: ['CAR12', 'Honda', 'Accord', 'Black', 'Tom'],
- chainId: 'mychannel',
  txId: tx_id
  };