Don't FC during startup chain relay if we might be able to salvage the channel by connecting to a peer

If we've been offline for a while and had a pending outbound HTLC, on startup we may replay blocks, notice its gonna expire and FC the channel, but if we had just waited long enough to connect to our peer they may have resolved the HTLC immediately on connection (with a failure, if they haven't FCd yet either). This is a much more important issue for LSP clients doing async sending on a mobile.