History of Settings::usable 2 changes

In crates/hub/src/signin.rs, lines 100–102 on c8684d44d549e0c7c40f0202032904814d318fbb5e75df1c5624225a06dc7668. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 100,102:crates/hub/src/signin.rs.