Bug: 326 fix switch wc

[L03TJ3]

Description

Before onboard didn't support wallet-connect switch requests at all, and just showed a modal notifying a user to do it manually. Newer implementation uses a custom request which works for metamask, but is not supported by either GD-Wallet or ZenGo (the two we currently use the customwalletconnect for)

• [x] - implement old implementation for handling switch-network requests

About # (link your issue here) https://github.com/GoodDollar/GoodProtocolUI/issues/326

How Has This Been Tested?

Tested with both GD-Wallet and ZenGo with new/old implementation.

Additional context

required network shown is the one user has clicked on in the network modal

[L03TJ3]

@patpedrosa we can update copy if needed

[L03TJ3]

Closed in favour of fix #53