refactor(overlay): fix a type error for rpcServer.functions.on

[skirtles-code]

The current code is:

const rpcServer = getRpcServer<typeof functions>()
rpcServer.functions.on('toggle-panel', (state = !panelVisible) => {
  togglePanelVisible(undefined, state)
})

TypeScript reports an error for rpcServer.functions.on. The typing for rpcServer.functions comes from the second generic parameter of getRpcServer, which isn't specified in the line above. I believe typeof functions needs to be the second parameter ('local functions'), rather than the first ('remote functions').

I've changed it to getRpcServer<never, typeof functions>(). I used never because we don't use any remote functions in this part of the code.

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commit: fb5b0f9