Force close fallback unresponsive

[Roasbeef]

When a channel is shown as "inactive" the user should be able to clic on the x within the channels row and still attempt to close. The internal logic should detect that the peer we have the channel open with isn't currently online/inactive and prompt the user to confirm that they want to attempt a force close. A force close differs from a regular close in that lnd will need to wait a relative CSV delay before sweeping.

This worked in the past, so a regression must have been introduced recently (ish).