Don't switch to that room when getting "Failed to load timeline position"

When there is a timeout on /context, riot gives a modal error:

Failed to load timeline position
Tried to load a specific point in this room's timeline, but was unable to find it.

then switches context to the room. It should not switch to the room, as in most cases if you're seeing this dialog you will have moved already.

Click the "go up to unread" at a time when /context is timing out.

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