When we launch new UI, ONLY return ticker passed in on getMarket in returnTicker

[JonathonDunford]

We currently need all tickers in every getMarket call because of old ED code.

When we launch new UI, specify the token when grabbing tickers and returnTicker will only show data of that passed in token.

# get all tickers
tickers = await get_tickers()

 # if token is passed in
    if token:
        

Should become

 # if token is passed in
if token:
        
        # get ticker for passed in token
        tickers = await get_tickers(token)

else:
        # get all tickers
        tickers = await get_tickers()

in get_market() in websocket_server.py