fix: re-read the state file when its path is set after loadrelease/0.4.0

The load-time restore read `wttrin-state-file` at whatever path the option held when wttrin loaded. A `setopt` in a use-package `:config` block runs after that read, so `d` wrote the new file and the next start never opened it. The default reverted to the init value on every restart.

I gave the option a `:set` handler that stores the value and re-runs `wttrin--state-load` from the new path. `setopt`, `customize-set-variable`, and Customize all route through it. When the restore changes the effective favorite while the mode-line mode is on, the mode-line refreshes to the restored city. A plain `setq` after load still waits for the next restore, and the docstring now says so.

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