Lost connection to Metamask when switching connection to Optimism

[ddobryakredknee]

Steps to reproduce:

1. open https://app.uniswap.org/#/swap?chain=mainnet
2. connect Metamask wallet
3. go to Metamask plugin and switch chain to Optimism (please take attention that switching chain should be done in Metamask, and not via Uniswap UI)

Result:
Uniswap shows that wallet is not connected, choosed chain reset to Ethereum.

Expected result:
Uniswap should keep connection to Metamask, chain should be changed to Optimism

[ddobryakredknee]

opened issue for it:
#4198