History of Settings::usable 2 changes

In crates/hub/src/signin.rs, lines 100–102 on a66c05a6a8810613fb902650d949569c2b18cde7ad34f2ea644b5de4f9a44944. 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.