hammerspoon: load ~/.config/hammerspoon/local.lua where a machine has one

The shell has ~/.localprofile and ssh and git their config-local; Hammerspoon
had nothing, so a machine wanting one different hotkey had to edit the file
every machine shares. Only init.lua is linked, so the directory around it is
already the machine's own -- a sibling file there is in no repo.

Loaded last, so it can override anything above, and through pcall: a mistake
in a local file must not take the rest of the config down. Reload with
ctrl-shift-alt-h as usual.

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