RPC Checks | Add fallback to rpc[0]

[SamusElderg]

src/store/web3/actions.js
getRPCBlocks()

Just before pushing the list of resolved RPCs, but BEFORE it gets sorted by 'block':

• Count how many of the RPCs are 'good'
• If the count is === 0
• Then change rpcs[0].good = true or rpcs[0].block = 1
• So we want to change the first RPC (should be the main binance one) to fallback to being used, check if we use 'good' anywhere other than the PU screen, if we dont, just make the block = 1, if we do use it then also change that to 'good= true'

[SamusElderg]

Used block = 100 instead so that we don't potentially include negative block numbers when this is tested/checked during the random rpc selection function

Done: 5c86e27